渤海湾盆地南堡凹陷烃源岩地球化学特征与地质意义

Geochemical features and geologic significances of source rocks in Nanpu Sag, Bohai Bay Basin

刚文哲 仵岳 高岗 马亁 庞雄奇

Gang Wenzhe Wu Yue Gao Gang Ma Qian Pang Xiongqi

中国石油大学地球科学学院, 北京, 102249 2. 中国石油天然气股份有限公司冀东油田分公司石油勘探开发研究院, 河北, 唐山, 063004

College of Geosciences, China University of Petroleum, Beijing 102249, China 2. Research Institute of Petroleum Exploration and Development, Petro China Jidong Oilfield Company, Tangshan, Hebei 063004, China

通过对渤海湾盆地南堡凹陷烃源岩地球化学特征的多参数精细描述和对比研究认为,沙三段有效烃源岩厚度大,有机碳含量高达2.5%～8%,以Ⅱ1和Ⅰ型有机质为主,处于成熟—高成熟阶段,为好的有效烃源岩;沙一段有机碳含量1.2%～2.3%,有机质类型以Ⅱ2和Ⅲ型为主,为好的有效烃源岩。东三段有机碳含量0.2%～2.6%,以Ⅱ2型有机质为主,处于成熟演化阶段,为较好的有效烃源岩。因此,预测南堡凹陷勘探有利方向:第一类为紧邻以Ⅱ1和Ⅰ型有机质烃源岩为主的生烃凹陷分布的南堡1-2号构造和南堡3-4号构造;第二类为紧邻以Ⅱ2和Ⅰ型有机质烃源岩为主的生烃凹陷分布的高尚堡构造—柳赞构造;第三类是紧邻以Ⅱ2和Ⅲ型有机质烃源岩为主的生烃凹陷分布的老爷庙构造—北堡构造和南堡5号构造。

Fine description and comparative study of the geochemical features of source rocks in the Nanpu Sag of the Bohai Bay Basin have been made according to multiple parameters.It has been concluded that effective source rocks in the 3rd member of the Shahejie Formation are regarded as excellent effective hydrocarbon source rocks thanks to big thickness and high organic abundance(2.5%-8%).They are mainly of Ⅱ1 and Ⅰ organic types,and are in mature and over mature stages.Effective source rocks in the 1st member of the Shahejie Formation are regarded as good ones since the organic abundance ranges from 1.2% to 2.3%,and the organic types are dominated by Ⅱ2 and Ⅲ.Effective source rocks in the 3rd member of the Dongying Formation are regarded as relatively good ones of mature stage since the organic abundance ranges from 0.2% to 2.6%,and the organic type is dominated by Ⅱ2.3 regions favorable for exploration in the Nanpu Sag have been pointed out.1)Structures Nanpu1-2 and 3-4 close to hydrocarbon generation sags dominated by types Ⅱ1 and Ⅰ source rocks.2)Structures Gaoshangpu and Liuzan close to hydrocarbon generation sags dominated by types Ⅱ2 and Ⅰ source rocks.3)Structures Laoyemiao-Beipu and Nanpu5 close to hydrocarbon generation sags dominated by types Ⅱ2 and Ⅲ source rocks.

国家科技重大专项(2011ZX05006-006)资助

https://doi.org/10.11781/sysydz201201057