Reservoir tightening process and its coupling relationship with hydrocarbon accumulation in the fourth member of Upper Triassic Xujiahe Formation in the Western Sichuan Depression, Sichuan Basin

被引：0

作者：

Lin L. ^{[1
,2
]}

Yu Y. ^{[1
,2
]}

Nan H. ^{[3
]}

Chen H. ^{[1
,2
]}

Liu L. ^{[1
,2
]}

Wu D. ^{[1
]}

Wang Z. ^{[1
,2
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu

[2] Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu

[3] Exploration & Production Research Institute, Southwest Oil & Gas Company, SINOPEC, Chengdu

来源：

Oil and Gas Geology | 2021年 / 42卷 / 04期

关键词：

Hydrocarbon accumulation; Reservoir tightening process; Sichuan Basin; Tight sandstone; Western Sichuan Depression; Xujiahe Formation;

D O I：

10.11743/ogg20210404

中图分类号：

学科分类号：

摘要：

The Upper Triassic Xujiahe Formation in Western Sichuan Depression is rich in hydrocarbon resources and has been one of the major tight gas pay zones in the area. By focusing on the tight sandstone of the fourth member of the formation, this study aims to answer why the stone is so tight and what factors had affected its tightening-up process based on petrological characteristics, reservoir physical property and diagenesis analyses, which are also combined with hydrocarbon accumulation history to confirm a possible coupling relationship between the two processes. It reveals that compaction caused great porosity loss in the stone. However, it was the late-stage precipitation of carbonate cements in a semi-closed to a closed setting that played a key role in the process by reducing the porosity of high-quality reservoirs in the formation to less than 10% during the middle and late stages of mesodiagenesis (corresponding to the Early Cretaceous). Fluid inclusions and laser Raman compositional analyses suggest two hydrocarbon accumulation periods, of which the second period (the Late Jurassic-Early Cretaceous) contributed more. It also suggests that when other types of reservoirs in the basin were entering the tightening-up stage, i. e. when their porosity was reduced to less than 10%, hydrocarbon accumulation in the fourth member of Xujiahe Formation was still ongoing, indicating a precedence of reservoir tightening to hydrocarbon accumulation. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.

引用

页码：816 / 828

页数：12

共 34 条

[1] Zhang Guosheng, Zhao Wenzhi, Yang Tao, Et al., Resource evaluation, position and distribution of tight sandstone gas in China, Strategic Study of CAE, 14, 6, pp. 87-93, (2012)
[2] International Energy outlook 2017, (2017)
[3] Zou Caineng, Zhu Rukai, Wu Songtao, Et al., Types, characteristics, genesis and prospects of conventional and unconventional hydrocarbon accumulations: taking tight oil and tight gas in China as an instance, Acta Petrolei Sinica, 33, 2, pp. 173-187, (2012)
[4] Zou Caineng, Yang Zhi, He Dongbo, Et al., Theory, technology and prospects of conventional and unconventional natural gas, Petro-leum Exploration and Development, 45, 4, pp. 575-587, (2018)
[5] Yu Xinghe, Li Shunli, Yang Zhihao, Discussion on deposition-diage-nesis genetic mechanism and hot issues of tight sandstone gas reservoir, Lithologic Reservoirs, 27, 1, pp. 1-13, (2015)
[6] Zhu Xiaomin, Pan Rong, Zhu Shifa, Et al., Research progress and core issues in tight reservoir exploration, Earth Science Frontiers, 25, 2, pp. 141-146, (2018)
[7] Zhang Shaonan, Discussion on the diagenesis and timing of tight sandstone reservoir in Xujiahe Formation, western Sichuan Basin, Mineralogy and Petrology, 29, 4, pp. 33-38, (2009)
[8] Lin Xiaobing, Liu Liping, Tian Jingchun, Et al., Fine exploration of tight sandstone gas reservoirs in the Xujiahe Formation, Hexingchang-Fenggu area, the western Sichuan Basin, Oil & Gas Geology, 34, 1, pp. 77-84, (2013)
[9] Meng Wanbin, Lu Zhengxiang, Liu Jiaduo, Et al., Reservoir controlling factors and geological prediction models of the 4<sup>th</sup> member of the Xujiahe Formation in Xiaoquan-Xinchang area, the western Sichuan Basin, Oil & Gas Geology, 34, 4, pp. 483-490, (2013)
[10] Yu Y, Lin L B, Gao J., Formation mechanisms and sequence response of authigenic grain-coating chlorite: evidence from the Upper Triassic Xujiahe Formation in the southern Sichuan Basin, China, Petro-leum Science, 13, 4, pp. 657-668, (2016)

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