渤海海域优质烃源岩及其分布预测

High-quality source rocks and their distribution prediction in the Bohai Sea waters

庞雄奇 郭永华 姜福杰 尹相东 马行陟 郭恩珍

Pang Xiongqi Guo Yonghua Jiang Fujie Yin Xiangdong Ma XingZhi Guo Enzhen

采用地质统计和地化分析相结合的手段,初步建立了评价和预测优质烃源岩的方法体系,对渤海海域古近系优质烃源岩的发育分布进行了预测.结果表明,纵向上沙河街组优质烃源岩厚度大、品质好,占暗色泥岩比例较大,东营组尽管暗色泥岩厚度较大,其中能达到优质的部分却很少.平面上,渤中凹陷优质烃源岩厚度最大,分布面积最广,其次是辽东湾地区以及岐口凹陷和黄河口凹陷.沙河街组四段+孔店组烃源岩主要发育辽东湾地区、莱州湾凹陷和岐口凹陷.总体而言,沙河街组为渤海海域的主力烃源岩,且以沙河街组三段最为重要.

Although dark mudstones are well developed in the Paleogene of the Bohai Sea waters,the major source rocks are still poorly understood,constraining the planning of exploration strategy.To tackle the problem,researchers redefined the high-quality source rocks and preliminarily developed a systemic method for its evaluation and prediction.The method was applied to the prediction of source rocks in the Paleogene in the Bohai Sea waters.The following understandings were obtained.Vertically,the source rocks in the Shahejie Formation are large in thickness,high in quality and relatively large in proportion to the dark mudstones.In contrast,although the dark mudstones in the Dongying Formation are large in thickness,high-quality source rocks are rare.Laterally,source rocks in the Bozhong depression are the largest in both thickness and distribution,followed by Liao-dong Bay,Qikou and Huanghekou depressions.Source rocks of Es-Ek are mainly developed in Liaodong Bay area,Laizhou Bay and Qikou depressions.In general,the major source rocks in the study area are considered to come from the Shahejie Formation,of which the Es is the most important.

10.11743/ogg20090401