乌石东区流沙港组地层断裂控砂机制

发布时间：2018-05-02 08:33

本文选题：断裂沉积耦合 + 钻探方向　；参考：《断块油气田》2017年03期

【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。
[Abstract]:Based on seismic, drilling and core observation data, the characteristics of fault development and sedimentary facies distribution in Wushi Eastern region are carefully carried out, the relationship between fault and sedimentation in Wushi Eastern region is clarified, and the mode of controlling sand body deposition by fault combination is expounded. The results show that the strata of the Liushagang formation in the eastern part of Wushi District are formed in parallel and reverse parallel fault assemblages, and the specific forms are fault trenches, fault troughs, strike slopes and break of fault slopes respectively. Along the fault strike, the grain size of sandstone becomes finer, the separation becomes better, the sand body thickness is large, the grain size is coarse, and the distribution of sand body is controlled obviously by faults. The controlling effect of fault on sand body deposition is that the movement of fault leads to the formation of relative bulge in the rising plate and the formation of relatively low area in the descending plate, and the sand body converges from the uplift to the low ground. At the same time, along the fault strike, the sand body preferentially chooses the location where the fault activity is weak and accumulates to the low ground.
【作者单位】：中海石油(中国)有限公司湛江分公司;中国石油大学(北京)非常规天然气研究院;中国石油大学(北京)非常规油气协同创新中心;中国石油大学(华东)地球科学与技术学院;
【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)
【分类号】：P618.13

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