Evolution Model for the Gas Reservoirs in the Shaximiao Formation, Eastern Slope of the Western Sichuan Depression

doi:10.19657/j.geoscience.1000-8527.2018.05.08

Abstract

Abstract:

The Shaximiao Formation is the main gas-producing sequence in the eastern slope of the Western Sichuan Depression, and its trap type is dominantly tectonic-lithologic trap.Most of the gas reservoirs are composed of tight sandstones with well-developed faults and fractures, which effectively improved the physical properties of reservoirs. The coupling patterns of fault and sandstone and their tectonic evolution are of great importance to the hydrocarbon accumulation.Our analyses on the dynamic evolution,gas-water distribution characteristics and hydrocarbon formation sequence of the gas reservoirs in the Shaximiao Formation (and the integration with regional tectonic evolution and hydrocarbon accumulation periods) concluded that gas accumulation in the Shaximiao Formation was influenced by tectonic uplifts, fault-sandstone configurations,physical properties of reservoir and tectonic evolution.This formed the reservoiring evolution patterns that are of tectonic orientation-controlled, fault-reservoir migrating-controlled,reservoir accumulation-controlled and evolution modification-controlled.The control of paleostructures in the Gaomiaozi region is more pronounced, while the Zhongjiang region is dominated by lithologic-control.Gas reservoirs in the Shaximiao Formation are featured by the three Yanshanian episodic reservoiring, and the subsequent Himalayan modification.The multi-phase tectonic evolution and strong reservoir heterogeneity have influenced the gas saturation,leading to the widely different gas distributions and reservoir productivity in the Shaximiao Formation.

Key words: gas reservoir evolution model, accumulation dynamics, episodic reservoiring, gas reservoir, Shaximiao Formation, Western Sichuan Depression

CLC Number:

TE122

XU Min, LIU Jian, LIN Xiaoyun, XIONG Shan, NIU Binli. Evolution Model for the Gas Reservoirs in the Shaximiao Formation, Eastern Slope of the Western Sichuan Depression[J]. Geoscience, 2018, 32(05): 953-962.

Figures/Tables 7

Fig.1 Regional structural map of the eastern slope of the Western Sichuan Depression

Fig.2 Maturity history of the source rocks in the eastern slope of the Western Sichuan Depression

Table 1 Paleo-pressure reconstruction of the accumulation periods using fluid inclusions

井	层位	深度/m	T/Ma	静水压力/MPa	捕获压力/MPa	压力系数	压力状态
中江15	$J s 2 2$	2 526.24~2 526.30	141~135	26.0	45.6	1.75	超压
川合118	$J s 3 3 - 2$	2 688.00~2 709.05	135~128	25.5	37.8	1.48	超压
高庙33	$J s 3 3 - 2$	2 814.54~2 814.59	135~130	28.4	30.3	1.07	常压
高庙33	$J s 3 3 - 2$	2 818.15~2 818.20	83~68	41.2	35.6	0.86	低压
高沙301	$J s 3 3 - 2$	2 868.27~2 868.31	105~92	34.3	39.5	1.15	常压
江沙15	$J s 2 1$	2 384.57~2 384.61	100~88	28.4	42.5	1.50	超压
江沙15	$J s 1 4$	2 307.80~2 307.85	73~68	36.3	36.6	1.01	常压

Table 1 Paleo-pressure reconstruction of the accumulation periods using fluid inclusions

井	层位	深度/m	T/Ma	静水压力/MPa	捕获压力/MPa	压力系数	压力状态
中江15	$J s 2 2$	2 526.24~2 526.30	141~135	26.0	45.6	1.75	超压
川合118	$J s 3 3 - 2$	2 688.00~2 709.05	135~128	25.5	37.8	1.48	超压
高庙33	$J s 3 3 - 2$	2 814.54~2 814.59	135~130	28.4	30.3	1.07	常压
高庙33	$J s 3 3 - 2$	2 818.15~2 818.20	83~68	41.2	35.6	0.86	低压
高沙301	$J s 3 3 - 2$	2 868.27~2 868.31	105~92	34.3	39.5	1.15	常压
江沙15	$J s 2 1$	2 384.57~2 384.61	100~88	28.4	42.5	1.50	超压
江沙15	$J s 1 4$	2 307.80~2 307.85	73~68	36.3	36.6	1.01	常压

Fig.3 Evolution model of gas accumulation power of the Shaximiao Formation, eastern slope of the Western Sichuan Depression

Fig.4 Cross section of gas-water distribution in the Shaximiao Formation,eastern slope of the Western Sichuan Depression

Fig.5 Denudation thickness contour during the Himalayan Orogeny,eastern slope of the Western Sichuan Depression

Fig.6 Evolution model of the gas reservoir of the Shaximiao Formation, eastern slope of the Western Sichuan Depression

References 24

[1]	邓康龄, 余福林. 川西坳陷的复合构造与油气关系[J]. 石油与天然气地质, 2005, 26(2): 214-219.
[2]	李智武, 刘树根, 林杰, 等. 川西坳陷构造格局及其成因机制[J]. 成都理工大学学报(自然科学版), 2009, 36(6): 645-653.
[3]	孟昊, 钟大康, 李卓沛, 等. 川西坳陷中段上三叠统须家河组须五段层序格架与沉积相[J]. 地层学杂志, 2016, 40(3): 278-289.
[4]	谭万仓, 侯明才, 董桂玉, 等. 川西前陆盆地中侏罗统沙溪庙组沉积体系研究[J]. 东华理工大学学报(自然科学版), 2008, 31(4): 336-343.
[5]	朱宏权. 川西坳陷中段沙溪庙组沉积相与储层评价研究[D]. 成都: 成都理工大学, 2009: 9-19.
[6]	王丽英, 王琳, 张渝鸿, 等. 川西地区侏罗系沙溪庙组储层特征[J]. 天然气勘探与开发, 2014, 37(1): 1-6.
[7]	谢刚平, 叶素娟, 田苗. 川西坳陷致密砂岩气藏勘探开发实践新认识[J]. 天然气工业, 2014, 34(1): 44-53.
[8]	杨克明. 川西坳陷须家河组天然气成藏模式探讨[J]. 石油与天然气地质, 2006, 27(6): 786-793.
[9]	王帅成, 王多义, 陈敏, 等. 川西坳陷中段沙溪庙组天然气成藏条件分析[J]. 海洋石油, 2010, 30(3): 42-46.
[10]	姜在兴, 田继军, 陈桂菊, 等. 川西前陆盆地上三叠统沉积特征[J]. 古地理学报, 2007, 9(2): 143-154.
[11]	魏民生. 川西坳陷东坡古构造恢复及其对天然气成藏的控制作用[D]. 武汉: 长江大学, 2017: 20-50.
[12]	李勇, 曾允孚, 伊海生. 龙门山前陆盆地沉积及构造演化[M]. 成都: 成都科技大学出版社, 1995: 10-17.
[13]	袁红英. 川西坳陷东坡沙溪庙组成藏过程研究[D]. 武汉: 长江大学, 2017: 2-10.
[14]	于冬冬, 汤良杰, 余一欣, 等. 川西和川东北地区差异构造演化及其对陆相层系天然气成藏的影响[J]. 现代地质, 2016, 30(5): 1085-1095.
[15]	林良彪, 陈洪德, 姜平, 等. 川西前陆盆地须家河组沉积相及岩相古地理演化[J]. 成都理工大学学报(自然科学版), 2006, 33(4): 376-383.
[16]	罗启后, 王世谦. 四川盆地中西部三叠系重点含气层系天然气富集条件研究[J]. 天然气工业, 1996, 16(1): 40-55.
[17]	郭迎春, 庞雄奇, 陈冬霞, 等. 川西坳陷中段陆相地层压力演化及其成藏意义[J]. 石油勘探与开发, 2012, 39(3): 426-433.
[18]	陈磊, 姜振学, 陈委涛, 等. 川西新场地区须五段泥页岩超压成因及其对含气性的影响[J]. 现代地质, 2016, 30(2): 406-412.
[19]	李善鹏, 邱楠生, 尹长河. 利用流体包裹体研究沉积盆地古压力[J]. 矿产与地质, 2003, 17(2): 161-165.
[20]	许浩, 魏国齐, 汤达祯, 等. 川西地区有机流体包裹体的特征分析及其地质意义[J]. 现代地质, 2004, 18(3): 360-365.
[21]	林小云, 魏民生, 丰勇, 等. 四川盆地川西坳陷东坡沙溪庙组油气成藏关键时刻研究[J]. 石油实验地质, 2017, 39(1): 50-57.
[22]	沈忠民, 刘阳, 刘四兵. 川西坳陷中段喜山期剥蚀厚度恢复[J]. 物探化探计算技术, 2011, 33(3): 90-194.
[23]	曹强, 叶加仁, 王巍. 沉积盆地地层剥蚀厚度恢复方法及进展[J]. 中国石油勘探, 2007, 12(6): 41-46.
[24]	罗啸泉, 安凤山. 川西坳陷圈闭分类[J]. 沉积与特提斯地质, 2007, 27(1): 67-71.