四川盆地川西坳陷上三叠统须家河组四段储层致密化过程及其与油气成藏的耦合关系

doi:10.11743/ogg20210404

Abstract

Abstract:

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.

Key words: hydrocarbon accumulation, reservoir tightening process, tight sandstone, Xujiahe Formation, Western Sichuan Depression, Sichuan Basin

CLC Number:

TE122.2

Liangbiao Lin, Yu Yu, Hongli Nan, Hongde Chen, Lei Liu, Dong Wu, Zhikang Wang. Reservoir tightening process and its coupling relationship with hydrocarbon accumulation in the fourth member of Upper Triassic Xujiahe Formation in theWestern Sichuan Depression, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 816-828.

Figures/Tables 14

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胶结物类型		胶结物含量/%
胶结物类型		含长石砂岩	贫长石砂岩	钙屑砂岩
碳酸盐胶结物	早期	1.2	1.3	6.5
碳酸盐胶结物	晚期	2.5	2.5	2.7
硅质胶结物	早期	0	0.2	0
硅质胶结物	晚期	0.5	0.7	0

储层类型	压实因子	不同深度孔隙度/%
储层类型	压实因子	1000m	2000m	3000m	4000m	5000m
含长石砂岩	0.00036	26.51	18.50	12.90	9.00	6.28
贫长石砂岩	0.00037	26.25	18.13	12.52	8.65	5.98
钙屑砂岩	0.00032	27.59	20.04	14.55	10.57	7.67

成岩期次	孔隙演化	储层孔隙度/%
成岩期次	孔隙演化	含长石砂岩	贫长石砂岩	钙屑砂岩
早成岩A期末	初始孔隙	38.0	38.0	38.0
	压实减孔	11.49	11.75	3.91
	胶结减孔	0	0	6.50
	溶蚀增孔	0	0.50	0
	定量孔隙	26.51	26.75	27.59
早成岩B期末	压实减孔	8.00	8.11	7.55
	胶结减孔	1.20	1.50	0
	溶蚀增孔	1.00	1.20	0.80
	定量孔隙	18.31	18.34	20.84
中成岩A期末	压实减孔	9.50	9.48	9.46
	胶结减孔	3.00	3.20	2.70
	溶蚀增孔	2.80	3.08	2.05
	定量孔隙	8.61	8.74	10.73
中成岩B期末	压实减孔	2.72	2.67	2.90
	胶结减孔	0	0	0
	溶蚀增孔	0	0	0
最终孔隙度计算值		5.89	6.07	7.83

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

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