广饶潜山下古生界差异侵蚀对油气富集的控制作用  

Differential erosion and its control effects on hydrocarbon accumulation of Lower Paleozoic in Guangrao buried hill of Dongying depression

作　　者：王建伟[1] 宋国奇[2] 孙国[1] 肖淑明[1] 蔡宏兴[1] 

机构地区：[1]中国石化胜利油田分公司现河采油厂,山东东营257068 [2]中国石化胜利油田分公司,山东东营257062

出　　处：《地质科学》2016年第3期908-919,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”（编号：2011ZX05006）资助.

摘　　要：广饶潜山是东营凹陷南缘一个典型下古生界古风化壳型潜山，含油气规模较大，但油气富集规律复杂。结合勘探实践，本文利用大量钻测井、岩石矿物及油气测试资料阐明了广饶潜山差异性侵蚀特征及其对油气富集规律控制作用。岩性组合差异及内幕断裂带导致岩体结构弱化，从而下古生界呈现差异性侵蚀。高泥质含量岩性组合单元的差异侵蚀易形成粘土充填沟谷，对油气沿古风化壳侧向运移具有良好遮挡作用；沿内幕断裂带差异侵蚀的沟谷对油气侧向运移没有区域遮挡能力，但明显控制多个潜山带的油气独立富集。下古生界差异侵蚀与油气富集规律密切相关，这对该领域研究具有很好的借鉴意义。Guangrao buried hill is a typical weathering crust of Lower Paleozoic in the southern margin of Dongying depression. Guangrao buried hill is characterized by the large hydrocarbon- bearing scale and complex hydrocarbon accumulation regularity. Based on a large number of drilling, logging and hydrocarbon test data, characteristics of differential erosion and its control effects on hydrocarbon accumulation regularities are recognized under the exploration practice in Guangrao buried hill. The rock mass structure is badly wakened by lithologic members with high shale contentand the inner faults of buried hill. The weathering crust of the Lower Paleozoic experiences sharply differential erosion in the studying area. Rapid erosion always occurs around the lithologic members with high shale content and along the inner faults. The erosion valley related to lithologic members is easily filled with massive clay, and good barriers are formed on lateral hydrocarbon migration along the ancient weathering crust; The erosion valley related to the inner fault has no regional barrier effect on lateral hydrocarbon migration, but obviously controls independent hydrocarbon accumulation of many buried hills. Therefore, the Lower Paleozoic differential erosion controls the hydrocarbon accumulation laws in the studying area, which has a very good referential value in the buried hill studying field.

关 键 词：差异侵蚀 油气富集 下古生界 广饶潜山 东营凹陷 

分 类 号：TE112.3[石油与天然气工程—油气勘探]