皖南泾县地区下三叠统殷坑组晏公堂剖面三维数字露头表征及油气地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.014

油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (1): 160-170.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.014

皖南泾县地区下三叠统殷坑组晏公堂剖面三维数字露头表征及油气地质意义

周磊^1,^2,³(),冯兴强^1,^2,³,包书景⁴(),谭元隆^1,^2,³,吴林^1,^2,³,张林炎^1,^2,³

1.中国地质科学院地质力学研究所, 北京 100081
2.自然资源部古地磁与古构造重建重点实验室,北京 100081
3.中国地质调查局油气地质力学重点实验室,北京 100081
4.中国地质调查局油气资源调查中心,北京 100083

收稿日期:2021-06-01 发布日期:2022-03-24 出版日期:2022-02-26
通讯作者: 包书景 E-mail:zhoulei4010@126.com;415530248@qq.com
作者简介:周磊（1987—）,男,博士,助理研究员,主要从事石油地质研究工作。地址：北京市海淀区民族大学南路11号,邮政编码：100081。 E-mail: zhoulei4010@126.com
基金资助:
中国地质调查局项目“重点地区构造体系及油气页岩气控藏条件调查”(DD20190085)

3D digital outcrop characterization and significance of petroleum geology of the early Triassic Yinkeng Formation Section in Jingxian County of southern Anhui

ZHOU Lei^1,^2,³(),FENG Xingqiang^1,^2,³,BAO Shujing⁴(),TAN Yuanlong^1,^2,³,WU Lin^1,^2,³,ZHANG Linyan^1,^2,³

1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2. Key Laboratory of Paleomagnetism and Paleotectonic Reconstruction, Ministry of Land and Resources of China, Beijing 100081, China
3. Key Laboratory of Petroleum Geomechanics, China Geological Survey, Beijing 100081, China
4. Oil & Gas Survey, China Geological Survey, Beijing 100083, China

Received:2021-06-01 Online:2022-03-24 Published:2022-02-26
Contact: BAO Shujing E-mail:zhoulei4010@126.com;415530248@qq.com

摘要/Abstract

摘要：

皖南泾县地区广泛出露下三叠统殷坑组,但其油气勘探程度相对滞后。通过野外露头调查、地质调查井岩心资料、测试分析数据,综合探讨皖南地区殷坑组沉积特征、生烃条件和储层条件。基于“无人机立体摄影”采集技术,对剖面露头进行创新的数字化调查,可提取构造和沉积信息。结合人工地质考察与剖面数字化,皖南地区泾县晏公堂殷坑组可划分为16小层;殷坑组岩性组合总体上为灰色泥粉晶灰岩、砾屑灰岩、角砾灰岩,夹黑色、黑灰色泥岩。殷坑组泥岩累计厚度43.8 m,TOC(总有机碳含量）为0.38 %~2.21 %,镜质体反射率为0.95 %~1.21 %,殷坑组页岩为较好烃源岩,具有巨大生烃潜力。殷坑组灰岩层段孔隙度在0.928 %~2.626 %,渗透率在（0.12~3.22）×10^-3 μm²,基质孔隙欠发育,渗透率低,但微裂缝和裂缝发育。因此,斜坡和开阔陆棚相带成为非典型“自生自储”有利沉积相带,殷坑组具有油气资源勘探潜力。

关键词: 沉积相, 油气潜力, 殷坑组, 皖南地区, 泾县

Abstract:

The oil and gas exploration of the Early Triassic Yinkeng Formation with wide distribution in the Jingxian County of the southern Anhui is relatively lagging. Based on the outcrop, well core and test analysis data, the depositional characteristics, hydrocarbon generation conditions and reservoir conditions of the Yinkeng Formation in southern Anhui are discussed. Using the “UAV stereo photography”, an innovative digital survey of the outcrop can be carried out to extract structural and sedimentary information. Combined with the artificial geology survey and the section digitization of the outcrop, the Yinkeng Formation can be divided into 16 sub-layers. The lithological of Yinkeng Formation is generally consist of gray mud limestone, conglomerate limestone and conglomerate limestone, with black and black gray mudstone. The cumulative thickness of the Yinkeng Formation is 43.8 meters with the TOC content ranging from 0.38 % to 2.21 % and the vitrinite reflectance ranging from 0.95 % to 1.21 %, indicating that the shales of the Yinkeng Formation is good source rocks and has a hydrocarbon potential. The porosity and permeability of limestones in the Yinkeng Formation range from 0.928 % to 2.626 %, and 0.12×10^-3 μm² to 3.22×10^-3 μm², respectively. The limestone intervals have under-developed matrix pores and low permeability, but have developed micro-fractures. Therefore, slopes and open shelf are favorable sedimentary facies with “self-generation and self-storage” petroleum system, and the Yinkeng Formation has large hydrocarbon potential.

Key words: sedimentary facies, hydrocarbon potential, Yinkeng Formation, southern Anhui, Jingxian County

中图分类号:

TE121

周磊,冯兴强,包书景等. 皖南泾县地区下三叠统殷坑组晏公堂剖面三维数字露头表征及油气地质意义[J]. 油气藏评价与开发, 2022, 12(1): 160-170.

Lei ZHOU,Xingqiang FENG,Shujing BAO, et al. 3D digital outcrop characterization and significance of petroleum geology of the early Triassic Yinkeng Formation Section in Jingxian County of southern Anhui[J]. Reservoir Evaluation and Development, 2022, 12(1): 160-170.

图/表 13

图1

图2

图3

图4

表1

下三叠统殷坑组晏公堂剖面测量"

地层		小层	层厚 (m)	岩性描述	含化石	采样及测试
统	组	小层	层厚 (m)	岩性描述	含化石	采样及测试
下三叠统	和龙山组	18	13.6	浅灰色薄层灰岩,含铁质结核
	殷坑组	17	18.5	上部为黑色页岩夹浅灰色薄层灰岩,下部为浅灰色薄至中厚层灰岩夹灰黑色页岩	含瓣鳃类：Claraia sp.
		16	21.8	黑灰色泥页岩夹薄层灰岩	含瓣鳃类：Posidonia sp.; 菊石：Gyrophiceras sp.,Koninckites sp.,Parakymatites sp.	泥页岩样品YGT-12,有机地球化学测试分析
		15	3.7	灰色中厚层灰岩和黑色泥页岩互层		泥页岩样品YGT-11,有机地球化学测试分析
		14	9.2	浅灰中厚层—厚层色砾屑灰岩、角砾灰岩,夹黑色页岩	含瓣鳃类：Posidonia sp.,Entolum sp.
		13	15.2	黑色页岩夹中厚层灰岩	含瓣鳃类：Claraia sp.,Posidonia sp.	泥页岩样品YGT-07、YGT-08、YGT-09、YGT-10,有机地球化学测试分析
		12	21.8	灰色、浅灰色厚层角砾灰岩,夹黑色泥页岩		灰岩样品YGT-05、YGT-06,铸体薄片,孔隙度和渗透率物性测试
		11	7.6	浅灰色、灰色薄层—中厚层灰岩与灰黑色页岩互层	含菊石：Gyronites sp.,Gyrophiceras sp.,Prionolobus sp.,Gyrolecanites sp.;含瓣鳃类：Eumorphotis sp.	泥页岩样品YGT-04,有机地球化学测试分析
		10	9.5	灰色厚层角砾灰岩夹中厚层灰岩
		9	4.7	浅灰色中厚层灰岩夹薄层灰岩
		8	5.3	深灰色薄层灰岩和中厚层灰岩互层		灰岩样品YGT-02,铸体薄片,孔隙度和渗透率物性测试
		7	3.0	深灰色薄层—中厚层灰岩夹黑色页岩,局部含同生角砾	含菊石：Gyronitidae
		6	3.0	灰色厚层角砾灰岩
		5	31.1	灰色薄—中层砾屑灰岩		灰岩样品YGT-01,铸体薄片,孔隙度和渗透率物性测试
		4	2.5	灰色薄层灰岩夹黑色页岩	含菊石：Meekoceras sp.瓣鳃类：Claraia cf. griesbachi	页岩样品YGT-03,有机地球化学测试分析
		3	0.7	灰色中厚层灰岩
		2	2.4	灰黑色泥页岩
上二叠统	大隆组	1	11.9	灰黑色硅质页岩夹泥页岩

表1

图5

表2

图6

表3

图7

图8

图9

图10

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样品	岩石热解						镜质体反射率(%)
样品	S₁(mg/g)	S₂(mg/g)	T_max (℃)	S₁+S₂(mg/g)	TOC(%)	氢指数(mg/g)	minR_o	maxR_o	meaR_o
TGY-03	0.14	0.54	435	0.68	0.45	119	0.97	1.14	1.08
TGY-04	0.14	0.56	434	0.70	0.53	105	0.92	1.12	1.07
TGY-07	0.27	1.84	440	2.11	1.07	172	0.91	1.23	0.95
TGY-08	1.06	3.18	444	4.24	2.21	144	1.11	1.30	1.21
TGY-09	0.21	0.84	440	1.05	0.61	138	0.94	1.21	1.18
TGY-10	0.31	1.44	437	1.75	1.02	141	0.78	1.26	1.12
TGY-11	0.06	0.50	442	0.56	0.58	87	1.05	1.35	1.21
TGY-12	0.06	0.31	444	0.37	0.38	82	0.93	1.23	1.17

样品	高压压汞				核磁共振
样品	φ_MIP (%)	k (10^-3μm²)	p₅₀ （MPa）	r₅₀ (μm)	φ_NMR (%)	峰型（个）
TGY-01	1.988	0.48	151.48	0.005	1.97	2
TGY-02	0.928	3.22	84.25	0.009	0.93	2
TGY-05	1.108	0.32	161.37	0.005	1.06	2
TGY-06	2.626	0.12	39.66	0.019	2.41	2

皖南泾县地区下三叠统殷坑组晏公堂剖面三维数字露头表征及油气地质意义

3D digital outcrop characterization and significance of petroleum geology of the early Triassic Yinkeng Formation Section in Jingxian County of southern Anhui

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