辽河坳陷石油地质条件、资源潜力及勘探方向
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摘要
近年来辽河坳陷潜山及非常规油气勘探不断取得突破,以往的资源评价成果已不足以支撑油气勘探部署。从基本石油地质条件入手,剖析了潜山、火山岩领域常规油及页岩油、致密油成藏地质条件与主控因素,建立了源储侧向对接型成藏、源外断层—不整合输导型成藏、源内或近源聚集型成藏及源储一体页岩油成藏等模式。采用以类比法为主导,以成因法、统计法为补充的综合评价方法,预测辽河坳陷常规石油资源量为40.96×10~8t,其中,碎屑岩领域资源量为27.39×10~8t,潜山领域资源量为11.42×10~8 t,火成岩领域资源量为2.15×10~8 t。采用小面元容积法,预测页岩油资源量为3.56×10~8t,致密油资源量为1.92×10~8 t。根据剩余石油资源分布和油藏形成条件,优选出有利勘探区带:兴隆台构造带、曙北—高升构造带、荣胜堡构造带和静安堡构造带是潜山油藏勘探有利区带;欢曙斜坡带、牛居—青龙台构造带、静西陡坡带和冷东—雷家构造带是碎屑岩油藏勘探主攻区带;小洼—月海构造带、大平房—葵花岛构造带、榆树台—盖州滩构造带是潜山和碎屑岩油藏兼探区带;黄于热—黄沙坨构造带是火山岩油藏勘探有利区带;西部凹陷雷家地区油页岩和大民屯凹陷西陡坡砂砾岩体分别是页岩油和致密油勘探有利目标。
Due to the breakthroughs in buried hills and unconventional o il and gas in recent years, the results of previous resource evaluation are not enough to support the exploration in Liaohe Depression. Based on analysis on the heterogeneity of source rocks and reservoirs, and the main controlling factors of conventional oils in buried hills and volcanic rocks, shale oil and tight oil, four patterns of hydrocarbon accumulation are setup such as lateral-docking of source-reservoir, immigration from out-source by fault-unconformity, accumulation in-source or near-source, and source-reservoir integrated shale oil. A comprehensive evaluation including analogy, genesis and statistics methods are used to assess the conventional oil resource in Liaohe Depression. The total amount is 40.96×10~8 t, including 27.39×10~8 t in clastic rocks, 11.42×10~8 t in buried hills, and 2.15 ×10~8 t in volcanic rocks. Shale oil of 3.56 ×10~8 t and tight oil of1.92×10~8 t are predicted respectively by using small panel volume method. According to the distribution of remaining oil resources, many favorable exploration plays are suggested. As for the conventional oil, the tectonic belts of Xinglongtai, Shubei-Gaosheng, Rongshengpu, and Jing'anpu are the favorable zones for buried hill reservoir; Huanshu slope belt, Niuju-Qinglongtai tectonic belt, Jingxi steep slope belt, and Lengdong-Leijia tectonic belt are the favorable zones for clastic reservoir; the tectonic belts of Xiaowa-Yuehai, Dapingfang-Kuihuadao, and Yushutai-Gaizhoutan are concurrent zones for both buried hill and clastic reservoir; Huangyure-Huangshatuo tectonic belt is the favorable zone for volcanic reservoir. As for the unconventional oil, the Paleogene Shahejie-4 shale with carbonate interlayer in Leijia area of West Sag is the main target for shale oil, and the glutenite reservoir in the west steep slope of Damintun Sag is the main target for tight oil.
Due to the breakthroughs in buried hills and unconventional o il and gas in recent years, the results of previous resource evaluation are not enough to support the exploration in Liaohe Depression. Based on analysis on the heterogeneity of source rocks and reservoirs, and the main controlling factors of conventional oils in buried hills and volcanic rocks, shale oil and tight oil, four patterns of hydrocarbon accumulation are setup such as lateral-docking of source-reservoir, immigration from out-source by fault-unconformity, accumulation in-source or near-source, and source-reservoir integrated shale oil. A comprehensive evaluation including analogy, genesis and statistics methods are used to assess the conventional oil resource in Liaohe Depression. The total amount is 40.96×10~8 t, including 27.39×10~8 t in clastic rocks, 11.42×10~8 t in buried hills, and 2.15 ×10~8 t in volcanic rocks. Shale oil of 3.56 ×10~8 t and tight oil of1.92×10~8 t are predicted respectively by using small panel volume method. According to the distribution of remaining oil resources, many favorable exploration plays are suggested. As for the conventional oil, the tectonic belts of Xinglongtai, Shubei-Gaosheng, Rongshengpu, and Jing'anpu are the favorable zones for buried hill reservoir; Huanshu slope belt, Niuju-Qinglongtai tectonic belt, Jingxi steep slope belt, and Lengdong-Leijia tectonic belt are the favorable zones for clastic reservoir; the tectonic belts of Xiaowa-Yuehai, Dapingfang-Kuihuadao, and Yushutai-Gaizhoutan are concurrent zones for both buried hill and clastic reservoir; Huangyure-Huangshatuo tectonic belt is the favorable zone for volcanic reservoir. As for the unconventional oil, the Paleogene Shahejie-4 shale with carbonate interlayer in Leijia area of West Sag is the main target for shale oil, and the glutenite reservoir in the west steep slope of Damintun Sag is the main target for tight oil.
引文
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[14]薛永安,余宏忠,项华.渤海湾盆地主要凹陷油气富集规律对比研究[J].中国海上油气,2007,19(3):146-148.
[15]刘海艳.辽河坳陷潜山油气资源参数体系研究与评价[J].特种油气藏,2015,22(6):56-60.
[2]孙洪斌,张凤莲.断陷盆地优质储层的成因:以辽河坳陷古近系沙河街组储层为例[J].岩性油气藏,2009,21(1):51-54.
[3]孙洪斌,张凤莲.辽河断陷西部凹陷古近系砂岩储层[J].古地理学报,2002,4(3):83-92.
[4]孟卫工,孙洪斌.辽河坳陷古近系碎屑岩储层[M].北京:石油工业出版社,2009.
[5]李春华,于鹏,毛俊莉,等.辽河坳陷东部凸起上古生界致密砂岩气成藏特征[J].特种油气藏,2013,20(1):19-22.
[6]李晓光,刘宝鸿,蔡国钢.辽河坳陷变质岩潜山内幕油藏成因分析[J].特种油气藏,2009,16(4):1-12.
[7]胡振华.辽河坳陷东部凹陷沙三段火成岩成因及储集特征[J].油气地质与采收率,2014,21(4):46-50.
[8]冷济高,庞雄奇,李晓光,等.辽河断陷西部凹陷油气成藏主控因素[J].古地理学报,2008,10(5):473-480.
[9]杨伟伟,柳广弟,王延山,等.辽河滩海地区油气成藏特征及其主控因素[J].海洋地质与第四纪地质,2011,31(6):117-124.
[10]周陆扬,刘怀山,姜建群,等.辽河盆地东部凹陷欧利坨子地区原油性质与成因[J].石油实验地质,2007,29(5):490-494.
[11]谢文彦,姜建群,张占文,等.大民屯凹陷油气系统研究[J].石油勘探与开发,2004,31(2):38-42.
[12]韩霞,田世澄,张占文,等.辽河断陷西部凹陷双台河口地区油源及运聚机理研究[J].特种油气藏,2006,13(2):36-42.
[13]朱芳冰,肖伶俐,唐小云.辽河盆地西部凹陷稠油成因类型及其油源分析[J].地质科技情报,2004,23(4):55-58.
[14]薛永安,余宏忠,项华.渤海湾盆地主要凹陷油气富集规律对比研究[J].中国海上油气,2007,19(3):146-148.
[15]刘海艳.辽河坳陷潜山油气资源参数体系研究与评价[J].特种油气藏,2015,22(6):56-60.