鄂尔多斯盆地林镇地区长4+5油层组油气成藏条件与机制
网络出版日期: 2013-10-08
基金资助
国家自然科学基金项目“淡水湖泊环境沉积单体脂类生物标志化合物氢同位素组成特征及其成因机制研究”(编号:41272125)资助
Reservoir formation conditions and mechanism of Chang 4+5 oil reservoir set in Linzhen area,Ordos Basin
Online published: 2013-10-08
在研究鄂尔多斯盆地林镇地区延长组长4+5油层组油气藏的油气生成、储层条件、运移条件、圈闭和聚集成藏等方面的基础上,综合分析了该区三叠系延长组长4+5油层组油气藏的形成条件,并总结了其形成机制。结果表明:林镇地区延长组长4+5油层组油气主要来自长7烃源岩:储层为三角洲前缘亚相各种成因类型的砂体,属于低孔、低渗储层;广泛发育的水下分流间湾暗色泥岩、致密粉砂岩以及粉砂质泥岩可形成良好的盖层;运移的动力主要来自长7泥岩形成的异常高压。长7烃源岩生成的油气在高剩余压力的驱动下,通过垂向叠合砂体与微裂缝向上运移进入长4+5储层,并沿连通的三角洲前缘砂体横向运移进入圈闭成藏,形成鼻隆构造油气藏、岩性油气藏以及构造一岩性油气藏,其形成受烃源岩、沉积相带、微裂缝、鼻隆构造以及剩余压力等因素的影响。
雷 扬 , 吴闻静 , 梁正洪 , 陈 兵 , 刘远志 . 鄂尔多斯盆地林镇地区长4+5油层组油气成藏条件与机制[J]. 岩性油气藏, 2013 , 25(4) : 11 -16 . DOI: 10.3969/j.issn.1673-8926.2013.04.003
Based on the research of hydrocarbon generation,reservoir conditions,migration,traps and accumulation,this paper systematically analyzed the forming conditions and mechanisms of Chang 4+5 oil reservoir set in Linzhen area.The result shows that the hydrocarbon of Chang 4+5 oil reservoir set is mainly generated from the Chang 7 source rocks,and the reservoir rocks are mostly delta front subfacies sandstone,which is considered to be low porosity and low perm eability reservoir.The dark mud rock,finer sihstone and sihpelite can effectively provide top cap rock for the reservoir.The anomalous pressure form ed by Chang 7 mudstone provides the force for migration.The hydrocarbon form ed by Chang 7 source rocks migrated into Chang 4+5 reservoir through the vertical folding sand bodies and micro—fractures under the high overpressure,vertically migrated into the traps along the delta front sand bodies and form ing reservoir,and form ed nose·shaped structural reservoir,lithologic reservoir and structural—lithologic reservoir,which are influenced by source rocks,sedimentary facies belt,micro-fractures,nose—shaped structure and overpressure.
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