Gas accumulation characteristics and exploration potential of the Carboniferous volcanic rocks in Junggar Basin

doi:10.3969/j.issn.1672-7703.2021.06.010

Abstract

Abstract: The degree of oil and gas discovery varies greatly in Junggar Basin and the proven rate of natural gas is low. Till now, the Carboniferous volcanic rock has the largest natural gas reserves of the basin, however, it shows complex gas accumulation characteristics indicated by exploration practice. Based on the core, thin section observation and lab test data of wells in Kelameili Gas Field, Wucaiwan Gas fi eld, Fukang Sag and Dibei Bulge, characteristics of the main source rocks of section b of Songkalsu Formation are studied, and the gas accumulation characteristics and exploration potential of the Carboniferous volcanic rocks are analyzed by combining with the studies on reservoir properties and gas sources. The results show that the source rocks of the Carboniferous are widely deposited in Wucaiwan Sag, Dishuiquan Bulge and Dongdaohaizi Sag, with an average TOC of 1.58%, organic matter type of mainly Type Ⅲ, and mostly in high mature stage.In addition, volcanic activity has promoted the hydrocarbon generation capacity of organic matter. High quality reservoirs are dominated by volcanic rocks of explosive and overfl ow facies, with pores and fractures developed, forming a good reservoir-caprock assemblage with the overlying the Permian or internal the Carboniferous tight layers. The gas accumulation conditions in the deep sag area are favorable for forming largescale gas reservoirs. The exploration potential is promising in Dinan Bulge, Dibei Bulge, Beisantai Bulge and Cheguai area.

CLC Number:

TE112.1

Zhang Lu, Li Jian, Song Yong, Chen Shijia, Lu Jungang, Guo Jianying, Zeng Yuan, Cui Huiying. Gas accumulation characteristics and exploration potential of the Carboniferous volcanic rocks in Junggar Basin[J]. China Petroleum Exploration, 2021, 26(6): 141-151.

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