摘要
在物源分析的基础上将原有砂组细分为小层,精细表征了成都凹陷沙溪庙组下段的沉积相平面展布特征及垂向演化规律。研究认为:受不同物源供给影响,研究区西部近物源方向发育辫状河三角洲,东北部远离物源方向发育曲流河三角洲,其主要沉积单元为三角洲前缘亚相,发育分流河道、水下分流河道、分流间湾、河口坝、泛滥平原等沉积微相类型。区内平面相展布具有较好的继承性,西部以近连片辫状河三角洲分流河道发育为主,东北部以条带状曲流河三角洲分流河道和鸟足状河口坝发育为主;垂向上,自下而上经历了水进-水退-水进的沉积演化过程。建立了研究区多物源控制下的不同类型三角洲沉积模式,为下一步勘探开发奠定了基础。
Based on the determination of provenance,the original sand groups of lower Shaximiao in Chengdu Sag were divided into sublayers,the plane distribution of sedimentary facies and vertical evolution rules of the target zones were characterized in detail.Study showed that braided-river delta was developed in the proximal provenance in the west of the study area and meandering-river delta was developed in the distal provenance in the northeast,and delta front and three types of sedimentary microfacies including underwater distributary channel,tributary bay and mouth bar were mainly developed.The plane phase distribution in the study area has good inheritance,the distributary channel of braided-river deltas in west and stripped distributary channel and pedate mouth bar of meandering-river deltas are mainly developed in the northeast.The study area develops sedimentary evolution experienced a process as water in-water backwater in from bottom to top.At the same time,different types of sedimentary delta models under the control of various orientations of provenance are established.The research results provides basic geologic foundation for the following exploration and development in the area.
出处
《石油天然气学报》
CAS
CSCD
2014年第12期56-59,5,共4页
Journal of Oil and Gas Technology
关键词
成都凹陷
下沙溪庙组
沉积相
三角洲
Chengdu Sag
Lower Shaximiao Formation
sedimentary facies
delta
