惠州凹陷HZ25转换带构造特征与成藏条件

发布时间：2019-03-29 19:01

【摘要】：根据最新采集处理的高质量三维地震及3口钻测井分析化验资料,探讨了珠江口盆地惠州凹陷HZ25转换带的构造特征及其对油气成藏的控制作用。精细构造解释、相干体切片及断层位移-距离关系分析表明,HZ25转换带是在NW—SE向拉张作用下形成的同向叠覆的构造转换带,连接F_1断层的下盘和F2断层的上盘,断层总位移量在其内部基本保持不变;构造转换带应力区还伴生形成F_3和F_4断层,并构成复杂的构造-古地貌格局,分割洼陷并控制储集体分布和油气运移方向;构造转换带是盆外隆起水系的入口,为大套粗粒三角洲及优质储层的发育提供了有利地质条件,相对高部位密集发育的断裂系统及三角洲砂体是油气运移和聚集的优良场所,构造变换带与其控制发育的厚层辫状河三角洲耦合,形成地层-岩性复合圈闭。HZ25构造转换带文昌组的油气突破,为惠州凹陷古近系油气勘探打开局面并提供了方向,分布在惠州凹陷边缘的一系列构造转换带是未来值得重视的勘探地区。
[Abstract]:Based on the high-quality three-dimensional seismic data obtained from the latest acquisition and processing, the structural characteristics of the HZ25 transition zone in Huizhou Sag, Pearl River mouth Basin, and its controlling effect on oil and gas accumulation are discussed in this paper. Fine structural interpretation, coherent body sections and fault displacement-distance relationship analysis show that the HZ25 transition zone is a coincident tectonic transition zone formed under the action of NW-SE tension, connecting the lower disk of fault F _ (1) and the upper disk of fault F _ (2), which is connected to the lower plate of fault F _ (1) and the upper disk of fault F _ (2). The total displacement of the fault remains basically the same in the inner part of the fault. In the stress zone of tectonic transition zone, Fx3 and FQ4 faults are also formed, which constitute complex tectonic-palaeogeomorphologic pattern, divide sag and control reservoir distribution and hydrocarbon migration direction. The structural transition zone is the entrance of the water system of the uplift outside the basin, which provides favorable geological conditions for the development of the large coarse delta and high quality reservoirs. The relatively high-density fault system and delta sand body are the excellent places for oil and gas migration and accumulation. The structural transformation zone is coupled with the thick braided river delta, which controls the formation of strata-lithology compound trap. The hydrocarbon breakthrough of Wenchang formation in HZ25 structural transition belt opened up the situation of Paleogene oil and gas exploration in Huizhou Sag and provided the direction for oil and gas exploration in the Paleogene, Huizhou Sag. A series of structural transition zones distributed in the margin of Huizhou sag are worth paying attention to in the future.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气与资源探测国家重点实验室;中海石油(中国)深圳分公司研究院;
【基金】：国家油气重大专项(2016ZX05001002)
【分类号】：P618.13

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