Natural Gas Exploration in Eastern Segment of Alkin Piedmont, Northern Qaidam Basin

Abstract

Abstract: The eastern segment of Alkin piedmont, northern Qaidam Basin, contains poor reservoir-seal assemblage and no effective source rocks, which are unfavorable for reservoir formation, making the oil and gas exploration very challenging in this basin. In this circumstance, deeper basic geological study was conducted and oil/gas reservoir forming conditions were re-analyzed. The results show that the eastern segment of Alkin piedmont exists under a background of paleo-uplift - paleo-slope structure, and has a composite conducting system of deep major faults and bedrock unconformity surfaces which connects the adjacent Lower Jurassic high - over mature source rocks. Moreover, the gneiss and granite in the basement with fractures and dissolution pores and vugs can serve as reservoirs, forming good reservoir-seal assemblage with the overlying Paleogene Luluhe Formation gypsum mudstone. Based on this understanding, a number of oil-bearing formations and blocks have been found by using proper logging, seismic and fracturing technologies, and the Dongping bedrock gas reservoir was discovered at the end of 2013 in the eastern segment of Alkin piedmont.

Key words: northern Qaidam Basin, eastern segment of Alkin piedmont, unconformity surface, bedrock gas reservoir

Fu Suotang, Ma Dade, Chen Yan, Wu Zhixiong, Wang Ye, Hao Xiaomei, Zhang Jihong. Natural Gas Exploration in Eastern Segment of Alkin Piedmont, Northern Qaidam Basin[J]. China Petroleum Exploration, 2015, 20(6): 1-13.

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