江汉盆地潜江凹陷古近系盐间页岩层系湖相白云岩储层发育特征及形成机理

doi:10.11743/ogg20210614

石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (6): 1401-1413.doi: 10.11743/ogg20210614

江汉盆地潜江凹陷古近系盐间页岩层系湖相白云岩储层发育特征及形成机理

沈均均¹(), 陶国亮², 陈孔全^1,*(), 李君军³, 王鹏万⁴, 李志明², 蒋启贵², 孟江辉¹

1. 长江大学非常规油气湖北省协同创新中心, 湖北武汉 430100
2. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
3. 中国石油浙江油田分公司, 浙江杭州 310013
4. 中国石油杭州地质研究院, 浙江杭州 610041

收稿日期:2021-07-25 出版日期:2021-12-28 发布日期:2021-12-16
通讯作者: 陈孔全 E-mail:shenhema@163.com;30760410@qq.com
作者简介:沈均均(1983-), 男, 博士、讲师, 沉积、储层及非常规油气资源评价。E-mail: shenhema@163.com
基金资助:
国家科技重大专项(2017ZX05049001-002);湖北省高等学校优秀中青年科技创新团队计划项目(T201905);湖北省自然科学基金项目(2016CFB601)

Development characteristics and formation mechanism of lacustrine dolomite reservoirs in the Paleogene inter-salt shale sequence, Qianjiang sag, Jianghan Basin

Junjun Shen¹(), Guoliang Tao², Kongquan Chen^1,*(), Junjun Li³, Pengwan Wang⁴, Zhiming Li², Qigui Jiang², Jianghui Meng¹

1. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China
2. Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu 214126, China
3. Zhejiang Oilfield Branch Company, PetroChina, Hangzhou, Zhejiang 310013, China
4. Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 610041, China

Received:2021-07-25 Online:2021-12-28 Published:2021-12-16
Contact: Kongquan Chen E-mail:shenhema@163.com;30760410@qq.com

摘要/Abstract

摘要：

以江汉盆地潜江凹陷盐间页岩层系潜江组三段下亚段4油组第10韵律层（潜三^{下（4-10）}韵律层）为研究对象，以钻井、岩心及测井数据为基础，结合薄片鉴定、扫描电镜、压汞、X衍射、岩石冷冻热解及饱和烃色谱-质谱等分析测试数据，对韵律层白云岩储层发育特征及形成机理进行研究。结果表明：①目的层矿物组成复杂，主要发育有富炭泥质白云岩相、富炭泥质灰岩相、富炭白云质泥岩相和富炭、钙芒硝充填云质泥岩相4种岩相类型，其中富炭泥质白云岩相为最有利岩相类型，具有有机质丰度高（有机碳含量3.3%~6.3%）、脆性矿物含量高（50%~76%）、粘土矿物含量低（18%~33%）和孔隙度高（10.8%~26.3%）的特点；②白云岩类储层储集空间以晶间孔隙为主，溶蚀孔、缝极少发育，孔隙之间的连通性差，孔隙结构不好；③泥质白云岩储层宏观分布受沉积环境控制明显，富炭泥质白云岩相主要出现在湖平面下降中期水体盐度适中的区域内，微观上，孔隙发育受压实作用控制明显，胶结和溶蚀作用影响较小；④早成岩作用阶段较弱的压实作用、准同生期白云石化作用及储层中油气的充注作用对晶间孔隙的保存具有积极的作用，是研究区储层形成的主要原因。

关键词: 储层发育特征, 储层成因, 盐间页岩层系, 白云岩, 潜江组, 潜江凹陷, 江汉盆地

Abstract:

This study deals with the 10^th cyclotherm of the 4^th oil layer group in the lower submember 3^rd of the member of Qianjiang Formation (hereafter referred to as Qian 3^L(4-10) cyclotherm), an inter-salt shale sequence in the Qianjiang sag, Jianghan Basin, with respect to the development characteristics and formation mechanism of dolomite reservoirs in the cyclotherm. The drilling, core and logging data serve as the research basis, in combination with analytical data from thin section identification, scanning electron microscopy (SEM), high pressure mercury intrusion porosimetry (MIP), X-ray diffraction, rock freezing and Rock-Eval pyrolysis, and gas chromatography-mass spectrometry (GC-MS) of saturated hydrocarbon. The results show that (1) the target layer features complicated mineral compositions of 4 lithic facies, including carbon-rich argillaceous dolomite, carbon-rich argillaceous limestone, carbon-rich dolomitic mudstone and carbon-rich dolomitic mudstone filled with glauberite. Among others, the carbon-rich argillaceous dolomite is considered the best, owing to its high abundance of organic matters in a range of 3.3% to 6.3%, high level of brittle minerals of 50% to 76%, low level of clay minerals of 18% to 33%, and high porosity of 10.8% to 26.3%; (2) The reservoir space of the dolomite reservoirs is dominated by intercrystalline pores, together with few dissolved pores and fractures, and these pores and fractures are characterized by poor structure and poor connectivity; (3) The macroscopic distribution of argillaceous dolomite reservoirs are significantly determined by sedimentary setting. For instance, the carbon-rich argillaceous dolomite mainly occurs in areas of moderate salinity during the middle phase of eustatic lake level descending. Microscopically, its pore development is markedly associated to compaction, while slightly to cementation and dissolution; (4) The weak compaction during the early diagenesis, the penecontemporaneous dolomitization and the hydrocarbon charging to reservoirs, all play a positive role in the preservation of intercrystalline pores, and are key to reservoir formation in the study area.

Key words: reservoir development characteristics, reservoir genesis, inter-salt shale sequence, dolomite, Qianjiang Formation, Qianjiang sag, Jianghan Basin

中图分类号:

TE122.2

沈均均,陶国亮,陈孔全,等. 江汉盆地潜江凹陷古近系盐间页岩层系湖相白云岩储层发育特征及形成机理[J]. 石油与天然气地质, 2021, 42(6): 1401-1413. doi: 10.11743/ogg20210614 Junjun Shen,Guoliang Tao,Kongquan Chen,et al. Development characteristics and formation mechanism of lacustrine dolomite reservoirs in the Paleogene inter-salt shale sequence, Qianjiang sag, Jianghan Basin[J]. Oil & Gas Geology, 2021, 42(6): 1401-1413. doi: 10.11743/ogg20210614

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井号	深度/ m	岩相	孔隙度/ %	渗透率/（10^-3 μm²）
W99	1 675.00	富炭泥质白云岩相	22.00	0.82
W99	1 675.00	富炭泥质白云岩相	19.30	—
W99	1 677.20	富炭泥质白云岩相	26.30	0.95
W99	1 678.47	富炭泥质灰岩相	25.23	—
W99	1 680.25	富炭泥质白云岩相	14.97	—
W99	1 680.65	富炭泥质白云岩相	23.83	—
BYY2	2 813.82	富炭、钙芒硝充填云质泥岩相	3.58	—
BYY2	2 814.10	富炭、钙芒硝充填云质泥岩相	5.25	—
BYY2	2 814.26	富炭、钙芒硝充填云质泥岩相	4.43	—
BYY2	2 815.27	富炭泥质白云岩相	12.19	6.65
BYY2	2 815.78	富炭泥质白云岩相	9.78	0.22
BYY2	2 816.44	富炭泥质白云岩相	12.57	0.41
BYY2	2 816.84	富炭泥质白云岩相	12.48	0.05
BYY2	2 816.93	富炭泥质白云岩相	10.92	1.25
BYY2	2 817.07	富炭泥质白云岩相	12.62	3.08
BYY2	2 819.52	富炭泥质白云岩相	10.78	1.40
BYY2	2 820.86	富炭泥质白云岩相	11.16	23.68
BYY2	2 817.11	富炭泥质白云质泥岩相	7.32	—
BYY2	2 817.23	富炭泥质白云质泥岩相	5.21	1.89
BYY2	2 817.26	富炭泥质白云质泥岩相	9.71	1.52
BYY2	2 817.56	富炭泥质白云质泥岩相	6.45	9.89
BYY2	2 822.51	富炭泥质白云质泥岩相	9.35	1.33

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江汉盆地潜江凹陷古近系盐间页岩层系湖相白云岩储层发育特征及形成机理

Development characteristics and formation mechanism of lacustrine dolomite reservoirs in the Paleogene inter-salt shale sequence, Qianjiang sag, Jianghan Basin

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