博兴洼陷风暴-滩坝沉积特征及模式

Sendimentary characteristics and model of tempestites-beach bar of upper section of the
fourth member of Shahejie Formation in Boxing Sag

王升兰 姜在兴 刘 晖

中海石油研究中心勘探研究部，北京 100027 中国地质大学能源学院，北京 100083

Exploration Department of PetroleumResearch Center, CNOOC , Beijing 100027,China School of Energy Resources, China University of Geosciences, Beijing 100083, China

综合岩心观察、粒度分析、测录井及地震资料对博兴洼陷沙四上亚段风暴岩及滩坝砂体的沉积特征、伴生关系及沉积模式进行了研究。博兴洼陷沙四上亚段沉积时期滩坝砂体广泛发育，并且在滨浅湖到半深湖较深水的过渡沉积环境中的滩坝砂岩与风暴岩具有良好的伴生关系，其理想的垂向层序自下而上包括6个部分：1）半深湖泥岩段；2）底部滩砂段；3）风暴岩沉积段；4）坝砂沉积段；5）顶部滩砂沉积段；6）滨浅湖泥岩段。风暴岩属于事件沉积，其在湖盆中分布较广，同时亦有较好的时间对比性，风暴－滩坝沉积模式的提出，对于在滨浅湖到半深湖过渡区域较深水沉积环境中寻找滩坝储集体具有一定的指导意义。

Based on the data of core, grading analysis, logging and seism,sendimentary characteristics, concomitant relations and depositional model of tempestites and beach bar of upper section of the fourth member of Shahejie Formation in the Boxing Sag have been studied. Beach bar sand bodies were widely developed during the deposition of upper section of the fourth member of Shahejie Formation in Boxing Sag, which have good concomitant relations with the tempestites in the transitional sedimentary environment
from shore-lacuatrine to dominantly deeper water of semi-deep lake. The ideal vertical sequence of tempestites-beach bar has six sections, bottom-up, they are semi-deep lake mud rock section, bottom beach sand section, tempestites section, bar sand section, top beach sand section and shore-shallow lacustrine mud rock section. The tempestites belong to event deposits, which is widely distributed in lake basin and also has better characteristics of time correlation. The idea of tempestites-beach bar sendimentary
model has some guiding significance on searching for beach bar reservoirs in the transitional sedimentary environment from shorelacuatrine to dominantly deeper water of semi-deep lake.