柴达木盆地阿尔金山前东段天然气勘探

摘要/Abstract

摘要： 柴达木盆地阿尔金山前东段缺乏烃源岩，储盖组合配置差，不利于油气成藏，是盆地油气勘探的难点。通过深化基础地质研究，重新分析了油气成藏条件，结果表明，阿尔金山前东段具有古隆起—古斜坡构造背景，存在深大断裂及基岩不整合面复合油气输导体系，沟通邻近下侏罗统高—过成熟烃源岩；该区基底片麻岩、花岗岩发育裂缝及溶蚀孔洞，具备储集条件，与上覆古近系路乐河组含膏泥岩构成良好储盖组合。在此基础上探索适用的测井、地震和压裂技术，发现了多个含气层系及区块，并于2013 年底在阿尔金山前东段探明东坪基岩气藏。

关键词: 柴达木盆地；阿尔金山前东段；不整合面；基岩气藏

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

付锁堂　马达德　陈琰　吴志雄　王晔　郝小梅　张继红. 柴达木盆地阿尔金山前东段天然气勘探[J]. 中国石油勘探, 2015, 20(6): 1-13.

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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