西湖凹陷K气田宝石组“源-渠-汇”及沉积体系分析  

Analysis of the"Source-ditch-sink"and Sedimentary System of Baoshi Formation in the K Gas Field of Xihu Sag

作　　者：于凯迪 孙莉[1] 严曙梅[1] 刘舒[1] 左一苇 郝伟航 YU Kaidi;SUN Li;YAN Shumei;LIU Shu;ZUO Yiwei;HAO Weihang(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院,上海200120

出　　处：《海洋石油》2024年第2期15-21,共7页Offshore Oil

基　　金：中国石油化工股份有限公司上海海洋油气分公司科技项目“孔雀亭地区宝石组潜力评价”(K-J-2022-05)。

摘　　要：西湖凹陷K气田宝石组的油气潜力可观,但其古地理环境尚不明确。该文应用"源-渠-汇"耦合的思想,利用地震及钻井资料对K气田宝石组进行沉积体系演化及展布研究,明确了宝石组沉积相类型及分布规律。结果表明,宝石组可以划分为宝上、宝下两段,物源主要来自西北部海礁凸起。K气田宝石组主要发育三角洲前缘亚相沉积,包括砂坝、分流主河道、分流次级河道、河道间沉积微相。研究区南、北两个次洼,是优势沉积汇聚区,其中宝上段的水下分流河道以及宝下段的砂坝为下一步勘探开发的有利目标。该研究可为K气田宝石组油气勘探提供参考。The oil and gas potential of Baoshi Formation in the K gas field of Xihu Sag is considerable,but its paleogeographic environment is not clear.In this paper,on the basis of the"source-ditch-sink"comprehensive analysis,the sedimentary system evolution and distribution of Baoshi Formation in the K gas field are studied by means of seismic and drilling data,and the sedimentary facies types and distribution rules of Baoshi Formation are defined.The results show that Baoshi Formation can be divided into the upper and the lower members and its sediments mainly come from the reef bulge in the northwest.Baoshi Formation of the K gas field mainly develops delta front subfacies deposits,including sand bar,distributary main channel,distributary secondary channel and interchannel sedimentary microfacies.The south and the north subdepressions in the research area are the dominant sedimentary convergence regions.The underwater distributary channel of the upper member and sand bar of the lower are favorable targets for further exploration and development.This study can provide reference for the petroleum exploration of Baoshi Formation in the K gas field.

关 键 词："源-渠-汇"系统 沉积体系 宝石组 西湖凹陷 

分 类 号：P618.13[天文地球—矿床学]