Source and exploration direction of tight oil and gas in the Dibei section of northern Kuqa depression

doi:10.3969/j.issn.1672-7703.2019.04.009

Abstract

Abstract: Tight oil and gas is an important exploration field in the Dibei section of the structural belt of northern Kuqa depression, but the overall exploration degree is low. In order to investigate the source of tight oil and gas in the Dibei section and ascertain its exploration potential, oil/gas-source correction was carried out after geochemical characteristics of hydrocarbon source rocks in different series of strata were analyzed. It is shown that the oil and gas in the tight reservoirs of Ahe Formation of Lower Jurassic is mainly contributed by the Triassic source rocks. Then, based on the test results of homogeneous temperature of hydrocarbon fluid inclusion in the Ahe Formation and the analysis results of single well thermal history and burial history, it is determined that there are hydrocarbon charging characteristics of three periods in the Ahe Formation. Combined with the dynamic evolution analysis on the hydrocarbon accumulation process in the Dibei section, it is shown that the hydrocarbon in the Dibei section has the characteristics of early oil and late gas. Finally, the early and late hydrocarbon accumulation models were established. It is ascertained that the distribution of tight gas reservoirs is under the joint control of the effective expulsion intensity of source rocks and the fracture development degree of tight reservoirs. What’s more, it is predicted that the favorable exploration area of tight gas reservoirs in Ahe Formation is located along the northern margin of Dibei.

CLC Number:

Li Jin, Wang Chao, Li Jian, Ma Wei, Zhang Haizu, Lu Yuhong, Li Dejiang, Liu Mancang. Source and exploration direction of tight oil and gas in the Dibei section of northern Kuqa depression[J]. China Petroleum Exploration, 2019, 24(4): 485-497.

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