Differentiated Hydrocarbon Enrichment Factors of Bedrock Gas Reservoir in Piedmont Belt of Altun Mountain, Qaidam Basin

doi:10.7657/XJPG20200403

Abstract

Abstract:

The bedrock gas reservoir whose formation is closely related to structural uplift and fault activity is mainly distributed in the piedmont belt of the basin margin and has the characteristics of differentiated hydrocarbon accumulation. Based on the systematic teasing of the main reservoir-forming factors of the bedrock reservoir in the piedmont belt of the Altun Mountain in Qaidam basin and combined with the exploration status worldwide, the paper summarizes the differentiated hydrocarbon accumulation in the bedrock reservoir. The study results show that there are four main factors controlling the formation of the bedrock reservoir in the piedmont area of Altun Mountain: 1.Several local hydrocarbon generating centers in Jurassic strata control the distribution and abundance of the bedrock gas reservoir in the piedmont zone. 2.There are three tectonic steps including uplift belt, slope belt and depression area in the piedmont belt, and the bedrock traps in the slope belt near hydrocarbon generating center are featured with the priority of oil and gas charging and good preservation, which are favorable for reservoir forming. 3.The distribution of high-quality bedrock reservoir in the piedmont belt which is controlled by multiple factors such as lithology of bedrock and intensity of weathering and leaching affects the local enrichment of the bedrock gas reservoir. 4.As a result of multistage tectonic activities, the formation period and activity intensity of the faults in the piedmont belt are different, which control the bedrock trap formation and differentiated hydrocarbon accumulation. It is concluded that the differences in source rock distribution, reservoir development, structural framework and fault activity jointly contribute to the differentiated hydrocarbon accumulation in the bedrock reservoir in the piedmont belt of Altun Mountain.

Key words: Qaidam basin, Altun Mountain, piedmont belt, bedrock gas reservoir, differentiated enrichment, reservoir forming factor

CLC Number:

TE122.1

SUN Xiujian, MA Feng, BAI Yadong, WANG Bo, GUAN Bin, LUO Na, WEI Shunke. Differentiated Hydrocarbon Enrichment Factors of Bedrock Gas Reservoir in Piedmont Belt of Altun Mountain, Qaidam Basin[J]. Xinjiang Petroleum Geology, 2020, 41(4): 394-401.

Figures/Tables 7

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Table 1

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地层				构造运动阶段	断裂活动期次	油气成藏期次	断裂活动对成藏的作用
界	系	统	组	构造运动阶段	断裂活动期次	油气成藏期次	断裂活动对成藏的作用
新生界	第四系	更新统	七个泉组	喜马拉雅运动阶段	喜马拉雅运动晚期	持续充注、多期成藏	二次成藏
	古近系	上新统	狮子沟组		喜马拉雅运动晚期		二次成藏
			上油砂山组		喜马拉雅运动中期		持续控藏
			下油砂山组
		中新统	上干柴沟组
		渐新统	下干柴沟组		喜马拉雅运动早期		控制圈闭及早期成藏
		古—始新统	路乐河组		喜马拉雅运动早期	未成藏	控制圈闭及早期成藏
中生界	侏罗系	下侏罗统	湖西山组	燕山运动阶段	印支—燕山运动期		控制烃源岩分布
中生界	三叠系			印支运动阶段	印支—燕山运动期		控制烃源岩分布