Petrologic features and diagenetic evolution of fine-grained sedimentary rocks in continental lacustrine basins:A case study on the Lower Jurassic Da'anzhai Member of Yuanba area, Sichuan Basin

被引：0

作者：

Zhu Y. ^{[1
,2
]}

Jin Z. ^{[1
,2
]}

Jin K. ^{[3
]}

Guo Q. ^{[1
,2
]}

Wang H. ^{[1
,2
]}

Lyu P. ^{[1
,2
]}

Wang X. ^{[1
,2
]}

Shi Y. ^{[1
,2
]}

机构：

[1] College of Geosciences, China University of Petroleum (Beijing), Beijing

[2] State Key Laboratory of Petroleum Resources and Prospecting, Beijing

[3] Research Institute of Exploration and Development under Liaohe Oilfield Company, PetroChina, Panjin

来源：

Oil and Gas Geology | 2021年 / 42卷 / 02期

关键词：

Da'anzhai Member; Diagenetic evolution; Fine-grained sedimentary rock; Petrologic feature; Sichuan Basin; Yuanba area;

D O I：

10.11743/ogg20210218

中图分类号：

学科分类号：

摘要：

Core observation, thin section identification, scanning electron microscopy (SEM) and X-ray diffraction analysis were used to finely describe the petrological characteristics and diagenesis of fine-grained sedimentary rocks as well as to discuss rock types with hydrocarbon potential and their genesis in the Lower Jurassic Da'anzhai Member of Yuanba area in the Sichuan Basin.The results show that there are three types of rocks, namely mudstone (mudstone, conchoidal shale and calcareous mudstone), siltstone and limestone (conchoidal limestone).The main mineral components are quartz, clay minerals (dominated by illite/smectitem (I/S) mixed layer, illite, kaolinite and chlorite), calcite, feldspar and pyrite; the rock assemblages are mainly conchoidal shale and mudstone interbedded with conchoidal limestone.The fine-grained rocks, currently at the B sub-stage of the mesodiagenesis, experienced compaction, cementation, dissolution, metasomasis, recrystallization of clay minerals and hydrocarbon generation from organic matters, of which, compaction and cementation were the major factors controlling the physical properties of shale and limestone.It also shows that, controlled by sedimentation and diagenesis, the organic-rich shale and the conchoidal shale are two most promising rock types for hydrocarbon reservoirs.Also as a result of diagenesis processes, the conventional reservoirs of conchoidal limestone and limestone are too tight to hold any oil or gas, but the fine-grained sedimentary rock and conchoidal shale of less tight are wonderful unconventional shale gas reservoirs.This assumption was verified in field tests during which large volume of gas flew out of conchoidal shale, but none from the adjacent conchoidal limestone. The result also suggests that rocks with well-developed laminae and micro-laminae (observed under microscope) or with siliceous and calcareous compositions of directional arrangement are potentially high-quality reservoir rocks. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.

引用

页码：494 / 508

页数：14

共 37 条

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