黄骅坳陷歧口凹陷古近系沙三^2亚段辫状河三角洲沉积模拟实验研究  

Sedimentation simulation experiment of braided fluvial delta of the second submember of Member 3 of Paleogene

作　　者：文沾[1] 刘忠保[1] 何幼斌[1] 苑伯超[1] 罗进雄[1] 蒲秀刚[2] 陈长伟[2] 林常梅[2] 

机构地区：[1]长江大学地球科学学院,湖北荆州434023 [2]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《古地理学报》2012年第4期487-498,共12页Journal of Palaeogeography：Chinese Edition

摘　　要：黄骅坳陷歧口凹陷古近系沙河街组是大港油田油气勘探的主要目的层,该组主要发育辫状河三角洲和扇三角洲沉积砂体,其中辫状河三角洲砂体是有利的油气储集体。在区域构造、古地貌和沉积体系等研究基础上,应用沉积模拟技术,再现了研究区孔店物源辫状河三角洲的形成过程和沉积微相特征,在实验条件下,孔店物源辫状河三角洲可划分为3个亚相、7个微相。实验研究表明,基底沉降、相对湖平面升降、流量及流量变幅、加砂量(物源供给)等是影响辫状河三角洲的形成及其演化的控制因素。通过实际砂体和实验砂体厚度展布对比分析,预测了有利储集层分布区域。综合歧口凹陷原始地质模型和实验模拟成果,建立了模拟实验条件下歧口凹陷古近系沙三2亚段辫状河三角洲沉积模式。The Shahejie Formation of Paleogene in Qikou Sag of Huanghua Depression is the main target strata of Dagang Oilfield, which is dominated by braided fluvial delta and fan delta sandbodies. The braided fluvial delta is the favorable reservoir. Based on the study of regional tectonic, palaeogeomorphol-ogy feature, sedimentary system of the study area, the formation process of the braided fluvial delta is re-constructed and the sedimentary microfacies feature are observed through using the technology of simulation experiment. The experiment shows that the braided fluvial delta from the Kongdian provenance can be di- vided into 3 subfacies and 7 microfacies. The systematic study on the main controlling factors of the forma-tion and evolution of the braided fluvial delta is completed. It is proved that basement subsidence, rela-tive lake level changes, flow and flow fluctuation, amount of adding sand and mud （ sediment supply） and so on are the main controlling factors. By comparing the actual and the experimental thickness of sand body, the distribution of the favorable reservoir in the study area has been predicted. Based on the initial geological pattern and combining with the phenomena and results of the simulation experiment, the sedi-mentary model of the braided fluvial delta of the second submember of member 3 of Paleogene Shahejie Formation （Es3^2） in Qikou Sag of Huanghua Depression is set up under the experimental condition.

关 键 词：黄骅坳陷 歧口凹陷 沉积模拟 辫状河三角洲 控制因素 沉积模式 

分 类 号：P512[天文地球—地质学]