重庆市綦江区页岩地质特征及其对页岩气勘探的启示

doi:10.13809/j.cnki.cn32-1825/te.2022.01.010

摘要/Abstract

摘要：

通过野外剖面观察和实测,对重庆市綦江区安稳镇上奥陶统五峰组—下志留统龙马溪组页岩剖面进行了详细野外描述与实验分析等综合研究,安稳镇页岩剖面自下而上出露五峰组下部黑色硅质页岩、五峰组上部观音桥段深灰色介壳泥质灰岩、龙马溪组黑色页岩等岩性地层。主要有以下3点结论：①出露页岩段为当前勘探开发的主要层段,各项表征成藏条件的评价指标优越,TOC（总有机碳）含量为1.10 %~8.10 %,平均为3.40 %,有机质成熟度（R_o）平均为2.70 %,石英含量为33.90 %~56.60 %,平均为42.36 %,黏土含量为18.00 %~57.20 %,平均为42.62 %;②储集空间类型主要为微裂缝、有机质孔与无机质孔;③结合勘探开发实践,剖面五峰组—龙马溪组下部①—③小层黑色页岩为甜点段,是水平井轨迹有利穿行层段。

关键词: 地质特征, 五峰组—龙马溪组, 甜点段, 安稳镇, 重庆市

Abstract:

Detailed field description and experimental analysis have been carried out for Wufeng-Longmaxi Formation shale profile in Anwen Town, Qijiang, Chongqing, by field profile observations and field measurements. Three kinds of lithology formation, namely black siliceous shale of Wufeng Formation, dark gray shell argillaceous limestone of Guanyinqiao and black shale of Longmaxi Formation,are exposed from bottom to top in shale section of Anwen Town. There are three main conclusions. First, the exposed shale is the main formation of current exploration and development, the indicators of reservoir forming conditions are superior, TOC ranges from 1.10 % to 8.10 %, with an average of 3.40 %. The average R_o is 2.70 %; Quartz content ranges from 33.90 % to 56.60 %, with an average of 42.36 %, and clay content ranges from 18.00 % to 57.20 %, with an average of 42.62 %. Second, the main reservoir space types are microfracture, organic pore and inorganic pore. Third, combined with the exploration and development practice, the ①~③ subzone of black shale at the lower part of Wufeng-Longmaxi Formation is the sweet spot section, which is a favorable target of horizontal well.

Key words: geological characteristic, Wufeng-Longmaxi Formation, sweet spot section, Anwen Town, Chongqing

中图分类号:

TE132

高玉巧,刘娜娜,张培先等. 重庆市綦江区页岩地质特征及其对页岩气勘探的启示[J]. 油气藏评价与开发, 2022, 12(1): 119-129.

Yuqiao GAO,Nana LIU,Peixian ZHANG, et al. Geological characteristic and its implications of shale exploration in Qijiang, Chongqing, China[J]. Reservoir Evaluation and Development, 2022, 12(1): 119-129.

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生物带	陈旭等,2015	金淳泰等,1982
LM9	Spirograptus turriculatus带
LM8	Stimulograptus sedgwickii带	Monograptus sedgwickii带
LM7	Lituigraptus convolutus带	Oktavites communis带
LM6	Demirastrites triangulatus带	Demirastrites triangulates带
LM5	Coronograptus cyphus带	Pristiograptus leei带
LM4	Cystograptus wesiculosus带	Pristiograptus cyphus带
LM3	Parakidogr acumlnatus带	Orthograptus vesiculosus带
LM2	Akidograptus acuminatus带	Akidograptus acuminatus带
LM1	Persculptogr persculptus带	Glyptograptus persculptus带

小层	硅质含量	黏土矿物含量	碳酸盐矿物含量	有机质及黄铁矿含量
①	>70 %	15 %~20 %	0~5 %	5 %~10 %
②	55 %~60 %	20 %~25 %	5 %~10 %	10 %~15 %
③	50 %~60 %	25 %~30 %	5 %~10 %	10 %~15 %
④	40 %~50 %	30 %~40 %	5 %~10 %	5 %~10 %
⑤	35 %~40 %	55 %~60 %	5 %~10 %	0~5 %

层位	石英含量	黏土矿物含量	碳酸盐矿物含量
①—③	（42.7 %~56.6 %）/49.9 %	（18.0 %~39.1 %）/32.7 %	（1.5 %~13.8 %）/7.8 %
④—⑤	（33.9 %~48.5 %）/39.3 %	（27.7 %~57.2 %）/46.7 %	（1.0 %~20.4 %）/6.6 %