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

ZHAO Peirong. 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

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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

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