焦石坝地区茅一段储层特征及天然气勘探潜力

doi:10.13809/j.cnki.cn32-1825/te.2021.05.016

Abstract

Abstract:

In recent years, Sinopec has used the unconventional natural gas idea to strengthen the Permian natural gas exploration in eastern Sichuan and obtained industrial gas flow in the first member of Maokou Formation of several wells in Jiaoshiba of Fuling and its adjacent area, revealing a good prospect for natural gas exploration. In this paper, the sequence stratigraphy, sedimentary characteristics, hydrocarbon generation conditions, micro pore structure characteristics and gas bearing property of Mao-1 Member in Jiaoshiba area are systematically analyzed. The results show that: ① Mao-1 member can be divided into two fourth-order sedimentary cycles and eight small layers, which mainly develops four kinds of lithology such as Limestone, micritic limestone, nodular limestone and nodular micritic limestone. ② The average TOC of the Mao-1 Member ranges from 0.75 % to 0.87 %, which on the whole, belongs to carbonate source rock with medium organic matter abundance. The organic matter abundance of micritic limestone and nodular micritic limestone is relatively low, while the organic matter abundance of limestone and nodular limestone is relatively high. The type of organic matter is mainly type I and supplemented by type Ⅱ. R_o ranges from 1.71 % to 2.18 %, with an average of 1.97 %. ③ The Mao-1 Member is an ultra-low porosity and permeability reservoir, and the local layers show the characteristics of fractured reservoir. The reservoir space is mainly composed of organic pores, diagenetic contraction fissures of clay minerals, and grain margin fractures of mineral particles, followed by dissolution pores of carbonate minerals. Moreover, the pore size distribution is mainly mesoporous and macroporous. ④ The natural gas of Mao-1 member is mainly composed of methane with low heavy hydrocarbon content, which is typical dry gas; δ ¹³C₁ ranged from -31.25 ‰ to -31.12‰, δ¹³C₂ is between -35.28 ‰ and -31.23 ‰, δ¹³C₃is between -34.87 ‰ and -34.66 ‰, which is a typical oil type gas. The carbon isotope of alkane series is reversed, showing a trend of change δ¹³C₁>δ¹³C₂>δ¹³C_3. According to the characteristics, the natural gas from Mao-1 Member is the mixture of kerogen cracking gas and liquid hydrocarbon cracking gas. ⑤ Mao-1 Member has the characteristics of self-generated and self-reservoired, which is a set of special carbonate reservoir between shale reservoir and fractured reservoir. It is necessary to learn from shale gas exploration experience, strengthen sweet spot interval evaluation and adaptive engineering technology research, and promote the large scale production and benefit development of natural gas.

Key words: carbonate rock, organic matter abundance, maturity, reservoir micro pores, Mao-1 Member, natural gas, shale gas, Jiaoshiba Area

CLC Number:

TE132

Peirong ZHAO. Reservoir characteristics and gas exploration potential of Permian Mao-1 Member of Maokou Formation in Jiaoshiba Area[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 772-781.

Figures/Tables 9

Fig. 1

Fig. 2

Table 1

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig.7

Table 2

References 21

[1]	张健, 周刚, 张光荣, 等. 四川盆地中二叠统天然气地质特征与勘探方向[J]. 天然气工业, 2018, 38(1):10-20.
	ZHANG Jian, ZHOU Gang, ZHANG Guangrong, et al. Geological characteristics and exploration orientation of Mid-Permian natural gas in the Sichuan Basin[J]. Natural Gas Industry, 2018, 38(1):10-20.
[2]	魏国齐, 杨威, 刘满仓, 等. 四川盆地大气田分布、主控因素与勘探方向[J]. 天然气工业, 2019, 39(6):1-12.
	WEI Guoqi, YANG Wei, LIU Mancang, et al. Distribution rules, main controlling factors and exploration directions of giant gas fields in the Sichuan Basin[J]. Natural Gas Industry, 2019, 39(6):1-12.
[3]	杨跃明, 杨雨, 文龙, 等. 四川盆地中二叠统天然气勘探新进展与前景展望[J]. 天然气工业, 2020, 40(7):10-22.
	YANG Yueming, YANG Yu, WEN Long, et al. New exploration progress and prospect of Middle Permian natural gas in the Sichuan Basin[J]. Natural Gas Industry, 2020, 40(7):10-22.
[4]	郭旭升, 胡东风, 黄仁春, 等. 四川盆地深层—超深层天然气勘探进展与展望[J]. 天然气工业, 2020, 40(5):1-14.
	GUO Xusheng, HU Dongfeng, HUANG Renchun, et al. Deep and ultra-deep natural gas exploration in the Sichuan Basin: Progress and prospect[J]. Natural Gas Industry, 2020, 40(5):1-14.
[5]	胡东风, 王良军, 张汉荣, 等. 碳酸盐岩烃源岩气藏的发现及其油气地质意义——以四川盆地涪陵地区中二叠统茅口组一段气藏为例[J]. 天然气工业, 2020, 40(7):23-33.
	HU Dongfeng, WANG Liangjun, ZHANG Hanrong, et al. Discovery of carbonate source rock gas reservoir and its petroleum geological implications: A case study of the gas reservoir in the first Member of Middle Permian Maokou Formation in the Fuling area, Sichuan Basin[J]. Natural Gas Industry, 2020, 40(7):23-33.
[6]	李蓉, 苏成鹏, 石国山, 等. 川南地区茅口组一段瘤状灰岩储层成因[J]. 天然气地球科学, 2021, 32(6):1-10.
	LI Rong, SU Chengpeng, SHI Guoshan, et al. The discussion of the genesis of nodular limestone reservoirs of the first period of Maokou Formation of Permian in south Sichuan Basin[J]. Natural Gas Geoscience, 2021, 32(6):1-10.
[7]	郭彤楼. 四川盆地碳酸盐岩源岩气地质特征与勘探前景[J]. 西南石油大学(自然科学报版), 2021, 43(1):1-16.
	GUO Tonglou. Geological characteristics and exploration prospect of carbonate source rock gas in Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1):1-16.
[8]	张培先, 何希鹏, 高全芳, 等. 四川盆地东南缘二叠系茅口组一段页岩气藏地质特征及富集模式[J]. 石油与天然气地质, 2021, 42(1):146-157.
	ZHANG Peixian, HE Xipeng, GAO Quanfang, et al. Geological characteristics and enrichment pattern of Permian Mao-1 Member shale gas reservoirs at the southeastern margin of Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(1):146-157.
[9]	张水昌, 梁狄刚, 张大江. 关于古生界烃源岩有机质丰度的评价标准[J]. 石油勘探与开发, 2002, 29(2):8-12.
	ZHANG Shuichang, LIANG Digang, ZHANG Dajiang. Evaluation criteria for Paleozoic effective hydrocarbon source rocks[J]. Petroleum Exploration and Development, 2002, 29(2):8-12.
[10]	梁狄刚, 郭彤楼, 陈建平, 等. 中国南方海相生烃成藏研究的若干新进展(二):南方四套区域性海相烃源岩的地球化学特征[J]. 海相油气地质, 2009, 14(1):1-15.
	LIANG Digang, GUO Tonglou, CHEN Jianping, et al. Some progresses on studies of hydrocarbon generation and accumulation in marine sedimentary regions, Southern China(Part 2): geochemical sharacteristics of four suits of regional marine source rocks, South China[J]. Marine Origin Petroleum Geology, 2009, 14(1):1-15.
[11]	陈建平, 梁狄刚, 张水昌, 等. 中国古生界海相烃源岩生烃潜力评价标准与方法[J]. 地质学报, 2012, 86(7):1132-1142.
	CHEN Jianping, LIANG Digang, ZHANG Shuichang, et al. Evaluation criterion and methods of the hydrocarbon generation potential for China’s Paleozoic marine source rocks[J]. Acta Geologica Sinica, 2012, 86(7):1132-1142.
[12]	贾云倩, 刘子平, 任晓海, 等. 有机质类型分异规律及其主控机制—以威远志留系龙马溪组页岩储层为例[J]. 沉积学报, 2021, 39(2):341-352.
	JIA Yunqian, LIU Ziping, REN Xiaohai, et al. Organic matter type differentiation process and main control mechanism: case study of the Silurian Longmaxi formation shale reservoir in Weiyuan area[J]. Acta Sedimentologica Sinical, 2021, 39(2):341-352.
[13]	程克明, 熊英, 刘新月. 煤系源岩倾油倾气性研究[J]. 沉积学报, 2004, 22(S1):56-60.
	CHENG Keming, XIONG Ying, LIU Xinyue. Study on oil-prone and gas prone property of coal-measure source rocks[J]. Acta Sedimentologica Sinica, 2004, 22(S1):56-60.
[14]	朱彤, 俞凌杰, 王烽. 四川盆地海相、湖相页岩气形成条件对比及开发策略[J]. 天然气地球科学, 2017, 28(4):633-641.
	ZHU Tong, YU Lingjie, WANG Feng. Comparative analysis of the accumulation conditions and development strategies of the marine and lacustrine shale gas from the Sichuan Basin, China[J]. Natural Gas Geoscience, 2017, 28(4):633-641.
[15]	胡安平, 潘立银, 郝毅, 等. 四川盆地二叠系栖霞组、茅口组白云岩储层特征、成因和分布[J]. 海相油气地质, 2018, 23(2):39-52.
	HU Anping, PAN Liyin, HAO Yi, et al. Origin, Characteristics and distribution of dolostone reservoir in Qixia Formation and Maokou Formation,Sichuan Basin, China[J]. Marine Origin Petroleum Geology, 2018, 23(2):39-52.
[16]	胡东风, 王良军, 黄仁春, 等. 四川盆地东部地区中二叠统茅口组白云岩储层特征及其主控因素[J]. 天然气工业, 2019, 39(6):13-21.
	HU Dongfeng, WANG Liangjun, HUANG Renchun, et al. Characteristics and main controlling factors of the Middle Permian Maokou dolomite reservoirs in the eastern Sichuan Basin[J]. Natural Gas Industry, 2019, 39(6):13-21.
[17]	SLATT R M, O’BRIEN N R. Pore types in the Barnett and Woodford gas shales: Contribution to understanding gas storage and migration pathways in fine-grained rocks[J]. AAPG Bulletin, 2011, 95(12):2017-2030. doi: 10.1306/03301110145
[18]	LOUCKS R G, REED R M, RUPPEL S C, et al. Spectrum of pore types and networks in mudrocks and a descriptive classification for matrix-related mudrock pores[J]. AAPG Bulletin, 2012, 96(6):1071-1098. doi: 10.1306/08171111061
[19]	于炳松. 页岩气储层的特殊性及其评价思路和内容[J]. 地学前缘, 2012, 19(3):252-258.
	YU Bingsong. Particularity of shale gas reservoir and its evaluation[J]. Earth Science Frontiers, 2012, 19(3):252-258.
[20]	邹才能, 陶士根, 侯连华, 等. 非常规油气地质(第二版)[M]. 北京: 地质出版社, 2013.
	ZOU Caineng, TAO Shigen, HOU Lianhua, et al. Unconventional Petroleum Geology(Second Edition)[M]. Beijing: Geological Publishing House, 2013.
[21]	何希鹏. 四川盆地东部页岩气甜点评价体系与富集高产影响因素[J]. 天然气工业, 2021, 41(1):59-71.
	HE Xipeng. Sweet spot evaluation system and enrichment and high yield influential factors of shale gas in Nanchuan area of eastern Sichuan Basin[J]. Natural Gas Industry, 2021, 41(1):59-71.

地层		主要岩性	测井响应特征
段	小层	主要岩性	电阻率	GR值	三孔曲线振幅
茅一段	⑧	泥晶灰岩	高	较高	不明显
	⑦	瘤状灰泥灰岩、瘤状泥晶灰岩泥晶灰岩	较低	较低	不明显
	⑥	瘤状灰泥灰岩、瘤状泥晶灰岩	较低	高	不明显
	⑤	瘤状灰泥灰岩	较低	较低	变化不明显
	④	泥晶灰岩	高	较低	变化不明显
	③	灰泥灰岩、瘤状灰泥灰岩	低	高	波动
	②	瘤状灰泥灰岩、瘤状泥晶灰岩	较上下层段略有升高		变化不明显
	①	灰泥灰岩、瘤状灰泥灰岩	低	高	波动

井号	地层	厚度（m）	平均TOC（%）	有机质类型	平均R_o（%）	平均孔隙度（%）	孔隙类型	孔径分布占比（%）			矿物组成占比（%）			压力系数
井号	地层	厚度（m）	平均TOC（%）	有机质类型	平均R_o（%）	平均孔隙度（%）	孔隙类型	<2 nm	2~50 nm	>50 nm	黏土矿物	石英	碳酸盐岩	压力系数
JY66-1	P₂m¹	36.9	0.87	Ⅰ—Ⅱ₁	1.97	1.36	有机质孔占31 %;黏土矿物孔缝占23 %;脆性矿物孔缝占46 %	16	50	34	14.9	8.5	75.3	1.22
JY1HF	O₃w-S₁l	38	3.52	Ⅰ—Ⅱ₁	2.6	4.52	有机质孔占51 %;黏土矿物孔缝占43 %;脆性矿物孔缝占6 %	19	77	4	34.6	44.4	9.72	1.55

Reservoir characteristics and gas exploration potential of Permian Mao-1 Member of Maokou Formation in Jiaoshiba Area

RichHTML

PDF (PC)

Like

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 9

References 21

Related Articles 15

Metrics

Comments

Recommended 0

[1]	GAO Yuqiao, HE Xipeng, CHENG Xiong, TANG Xuan, HUA Caixia, ZAN Ling, ZHANG Peixian, CHEN Xuewu, PANG Yiwei. Discussion on high hydrocarbon generation efficiency of saline lacustrine source rocks with low TOC: A case study of the second member of Funing Formation, Qintong Sag, Subei Basin [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(5): 678-687.
[2]	HU Wenge, MA Longjie, WANG Yan, BAO Dian, ZHANG Yun. Application and reflections on efficient development of deep oil and gas reservoirs in Tarim Basin [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 519-528.
[3]	WANG Jiawei, ZHANG Bohu, HU Yao, HE Zhengyi, HU Xinxin, CHEN Wei, LUO Chao. Inversion of multiphase tectonic stress field and fracture evolution in shale gas reservoirs [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 560-568.
[4]	MIN Chao,LI Yingjun,LI Xiaogang,HUA Qing,ZHANG Na. Application of intuitive fuzzy MABAC method in optimizing favorable areas of low permeability carbonate gas reservoirs [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 577-585.
[5]	ZANG Suhua,JING Xiaoming,LIU Zhihua,YIN Yanling. Geological conditions for shale oil formation in the fourth member of Funing Formation of Eocene series in Jintan Basin [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 425-434.
[6]	LIANG Xiaobai, JU Wei. Fault connectivity evaluation based on topological structure analysis: A case study of multi-stage faults of deep shale gas reservoirs in central Luzhou Block, southern Sichuan [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 446-457.
[7]	GAO Quanfang,ZHANG Peixian,GUAN Linlin,LI Yanjing,NI Feng. Influence of lower-level reverse faults on shale gas enrichment and high yield: A case study of Pingqiao Dong-1 Fault in Nanchuan area, southeast margin of Sichuan Basin [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 458-467.
[8]	ZHANG Wen,LIANG Lixi,LIU Xiangjun,XIONG Jian,ZHANG Yinan. Etching morphology and mechanical properties of carbonate rocks under acid action [J]. Petroleum Reservoir Evaluation and Development, 2024, 14(2): 247-255.
[9]	CUI Yudong, LU Cheng, GUAN Ziyue, LUO Wanjing, TENG Bailu, MENG Fanpu, PENG Yue. Effects of creep on depressurization-induced gas well productivity in South China Sea natural gas hydrate reservoirs [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(6): 809-818.
[10]	YAO Hongsheng, WANG Wei, HE Xipeng, ZHENG Yongwang, NI Zhenyu. Development practices of geology-engineering integration in complex structural area of Nanchuan normal pressure shale gas field [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 537-547.
[11]	LI Jingchang, LU Ting, NIE Haikuan, FENG Dongjun, DU Wei, SUN Chuanxiang, LI Wangpeng. Confidence evaluation of fractures seismic detection in shale gas formations on WY23 Pad in Weirong [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 614-626.
[12]	XIA Haibang, HAN Kening, SONG Wenhui, WANG Wei, YAO Jun. Pore scale fracturing fluid occurrence mechanisms in multi-scale matrix-fracture system of shale gas reservoir [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 627-635.
[13]	HAN Kening, WANG Wei, FAN Dongyan, YAO Jun, LUO Fei, YANG Can. Production forecasting for normal pressure shale gas wells based on coupling of production decline method and LSTM model [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 647-656.
[14]	XUE Gang, XIONG Wei, ZHANG Peixian. Genesis analysis and effective development of normal pressure shale gas reservoir: A case of Wufeng-Longmaxi shale gas reservoir in southeast margin of Sichuan Basin [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 668-675.
[15]	LOU Zhanghua, ZHANG Xinke, WU Yuchen, GAO Yuqiao, ZHANG Peixian, JIN Aimin, ZHU Rong. Fluid response characteristics of shale gas preservation differences in Nanchuan and its adjacent blocks in Sichuan Basin [J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 451-458.