四川盆地上三叠统沉积储层研究进展与热点分析

doi:10.11743/ogg20210402

Abstract

Abstract:

The Upper Triassic in the Sichuan Basin is rich in both conventional and unconventional gases, the temporal and spatial distribution and enrichment of which are controlled by sedimentary reservoirs under an isochronous stratigraphic framework.Exploration activities in the basin have drawn greatly from sedimentary reservoir research and highlighted its scientific and strategic significance.Progresses made in the domain can be summarized as establishment of symmetrical and less symmetrical sequence stratigraphic models and their evolutionary patterns of the foreland basin based on previous Upper Triassic sequence stratigraphic frameworks.The Ma'antang Formation to the third member of Xujiahe Formation are marine deposits, and the fourth to the sixth member of Xujiahe Formation are continental deposits, though still under the effect of sea transgression.The Ma'antang Formation mainly consists of reef-shoal facies, lagoon facies, tidal flat lake and delta facies; the Xiaotangzi Formation mainly consists of barrier sand bar-lagoon facies with small deltas developed around basin.The second, fourth and sixth members of Xujiahe Formation are dominated by alluvial fans, fan deltas and braided river delta facies, the third member consists of costal-delta facies, and the fifth member is mainly composed of lacustrine-delta facies.Five major provenances existed during the Late Triassic in Sichuan Basin, including Qinling ancient land, Dabashan ancient land, Songpan-Ganzi fold belt, Kangdian ancient land, and Jianglan ancient land, with each providing sediment inputs of temporal and spatial differences in terms of nature, scope and extent.Sediments were largely sourced from the north part of the basin during the deposition of the second and third members of Xujiahe Formation.Tight sandstone reservoirs in the Xujiahe Formation are closely linked to compaction which caused great primary porosity loss and the quartz overgrowth in Ⅱ and Ⅲ phases that further reduced the primary porosity.The closed underground fluid environment also made its contribution to the formation of tight reservoirs.Sweet spots in the formation were controlled by microfacies, dissolution, chlorite lining, and fractures, and thus making the underwater branch channels at delta fronts the most promising targets for tight gas discovery.With major progresses in shallow water delta research and shale gas exploration in recent years, shallow water deltas, fine-grain sedimentology and deposition mechanisms, sedimentary process simulation and fine-grained reservoir characterization of the Upper Triassic in Sichuan Basin, have become the trending topics and future research directions.

Key words: sequence stratigraphy, transgressive process, fine-grained deposits, tight reservoir, depositional system, Upper Triassic, Sichuan Basin

CLC Number:

TE121.3

Zhensheng Shi, Xiaomin Zhu, Yaxiong Zhang, Hui Jin. Advances and trending topics in sedimentary reservoir research ofthe Upper Triassic Xujiahe Formation, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 784-800.

Figures/Tables 4

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地层				界面特征	层序地层划分方案							本文建议
系	统	组	段	界面特征	方案一		方案二			方案三		本文建议
下侏罗统						BW
三叠系	上统	须家河组	须六段		构造层序3		SLSC2	LSC5	MSC15-17	沉积层序4	HST	构造层序3	HST
											TST
											LST
			须五段					LSC4	MSC12-14	沉积层序3	HST		TST
			须五段					LSC4	MSC12-14		TST		TST
			须四段					LSC3	MSC9-11		LST		LST
			须三段		构造层序2		SLSC1	LSC2	MSC5-8	沉积层序2	HST	构造层序2	HST
			须三段					LSC2	MSC5-8		TST		TST
			须二段					LSC1	MSC1-4		LST		LST
		小塘子组			构造层序1					沉积层序1	HST	构造层序1	HST
		马鞍塘组			构造层序1					沉积层序1	TST	构造层序1	TST
	中统	雷口坡组

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Advances and trending topics in sedimentary reservoir research ofthe Upper Triassic Xujiahe Formation, Sichuan Basin

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