恩平凹陷古近系文昌组构造古地貌特征及砂体展布规律——少井条件下储集砂体预测与评价  

Structure Palaeogeomorphology Characteristics and Sand Bodies Distribution Regularities of Paleogene Wenchang Formation in Enping Sag:Under the Conditions of Lack of Drilling Data to Predict and Evaluate the Reservoir Sand Bodies

作　　者：曾智伟[1,2] 杨香华[1,2] 舒誉 陈胜红 吴静 王维[1,2] 夏晨晨 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国地质大学(武汉)资源学院,湖北武汉430074 [3]中海石油(中国)有限公司深圳分公司,广东深圳510240

出　　处：《现代地质》2015年第4期804-815,共12页Geoscience

基　　金：国家科技重大专项"南海东部海域已证实富烃凹陷构造-沉积体系;成藏主控因素及综合评价"(2011ZX05023-001-015)

摘　　要：综合利用恩平凹陷丰富的地震资料,通过古地貌特征分析、古沟谷识别及多相带联合追踪等方法,明确恩平凹陷古近系文昌组沉积时期的古地貌特征及砂体展布规律。恩平凹陷文昌组砂体成因和平面展布与沉积古地理背景及古沟谷密切相关:凹陷北部陡坡带受控洼断裂及古沟谷控制,发育一系列向北退覆式叠置的扇三角洲砂砾岩体,与中深湖相泥岩指状交互,其发育期次、规模与边界断裂活动密切相关;凹陷南部EP18-1继承性古隆起控制南部斜坡带的古沟谷发育与古地貌格局,将南部斜坡带分割成东西两个古沟谷物源供给体系,两个古沟谷体系分别控制EP17洼及EP18洼南斜坡辫状河三角洲的展布方向,而EP18-1继承性古隆起上则发育大型滩坝相砂体。Taking advantage of the extensive seismic data, the structure palaeogeomorphology characteristics and sand bodies distribution regularities of Paleogene Wenchang Formation in Enping Sag are discussed by correlated theories on the characteristics of palaeogeomorphology, identification of ancient valley and joint phase tracking. The causes and plane distribution of the sand bodies of Wenchang Formation are closely associated with the dep- osition of ancient geographical background and the ancient valley. The northern steep slope of Enping Sag is controlled with the fault and the ancient valley. It develops a series of north offlap fan-delta glutcnite bodies which interactively touches with the mid-deep lake facies mudstones, and its development period and scale is closely related to the boundary fault activity. The EP18 - 1 inherited palaeohigh has controlled the ancient valley develop- ment and ancient landform pattern of the southern slope, and the southern slope zone is divided into two ancient valley source supply systems. They control the distribution direction of the braided river delta in the south slope of EP17 and EPI8, while the EP18 -1 inherited palaeohigh develops large-scale beach bar sand body.

关 键 词：恩平凹陷 文昌组 古地貌 古沟谷 砂砾岩体 辫状河三角洲 滩坝 

分 类 号：P618.130.2[天文地球—矿床学] TE121.3[天文地球—地质学]