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

Abstract

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

CLC Number:

TE132

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.

Figures/Tables 17

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References 22

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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 %

Geological characteristic and its implications of shale exploration in Qijiang, Chongqing, China

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