乌石东区流沙港组地层断裂控砂机制  

Sand distribution mechanism of Liushagang Formation in eastern Wushi Area

作　　者：杨希冰 谌志远 满勇 胡林 满建 黄晴 YANG Xibing CHEN Zhiyuan MAN Yong HU Lin MAN Jian HUANG Qing(Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, China Unconventional Gas Research Institute, China University of Petroleum, Beijing 102249, China Unconventional Oil ＆ Gas Cooperative Innovation Center, China University of Petroleum, Beijing 102249, China School of Geosciences, China University of Petroleum, Qingdao 266580, China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中国石油大学(北京)非常规天然气研究院,北京102249 [3]中国石油大学(北京)非常规油气协同创新中心,北京102249 [4]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《断块油气田》2017年第3期342-345,共4页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题"南海西部海域低渗油藏勘探开发关键技术"(2016ZX05024-006)

摘　　要：综合利用地震、钻井、岩心观察等资料,精细落实乌石东区断裂发育及沉积相展布特征,明确乌石东区断裂与沉积关系,阐述断裂组合控制砂体沉积的模式。研究结果表明,乌石东区流沙港组地层发育同向平行型和反向平行型断裂组合,具体形态相应分别为断沟、断槽、走向斜坡以及断裂坡折。顺断裂走向,砂岩粒度变细、分选变好,靠近断裂下降盘,砂体厚度大、粒度粗,断裂对砂体展布具有明显控制作用。断裂对砂体沉积的控制作用表现为断层活动导致上升盘形成相对凸起,下降盘形成相对低地,砂体从凸起向低地汇聚。同时,沿断裂走向,砂体优先选择断层活动性较弱的位置向低地聚集。According to the seismic, drilling, core physical observation data, the characteristics of fracture development and sedimentary facies distributed in eastern Wushi Area were finely implemented, the relationship between faults and sedimentary facies was clarified, and the mode of fault combination controlling sand body deposition was illustrated. The results show that the Liushagang Formation in eastern Wushi Area developed fault combination in which faults are inclined in same or reverse direction, the corresponding specific forms are breaking channel, fault trough, strike slope and slope-break zone; along faults strike, sandstone grain size becomes finer, and sorting becomes better; close to the faults, the thickness of sand body is large and the sand grain size is coarse; the faults has obvious control effect on the distribution of sand body. The mechanism of faults controlling sand body deposition is obvious, fault activity leads to the rise of upward plate, the decline of downthrow plate. Also, along the trend of these faults, sand body that preferentially chooses the weak position converges from the raised to the low.

关 键 词：断裂沉积耦合 钻探方向 乌石东区 北部湾盆地 

分 类 号：TE122.21[石油与天然气工程—油气勘探] P681[天文地球—地质学]