摘要:
珠江口盆地H区块中新世珠江组碳酸盐储层研究存在两个棘手的问题,一是储层厚度薄,单层厚度在6~35 m之间,普遍小于纵向分辨率四分一波长;二是储层非均质性强、相变快,受沉积相控制明显,但区内尚未开展区域碳酸盐岩沉积相研究,沉积相类型及分布尚不清楚.针对上述问题,开展了以地震相分析为辅助,利用测井、录井划分的单井沉积相,再结合以岩性和地震波阻抗之间建立的岩石物理关系标定叠前反演的弹性阻抗数据体,尝试在研究区进行地震沉积成像研究,识别并圈定有利储集相带的台缘礁、台内礁、台内滩体的范围,综合划分的有利储层在工区钻井上得到了良好印证.
Abstract:
Carbonate reservoir, where is the Miocene Zhujiang Formation in H block of the Pearl River Mouth Basin, has two problems. Firstly, it is the thin reservoir thickness, which is between 6~35 m, generally less than the vertical resolution of 1/4 wavelength; Secondly, the reservoir is heterogeneity; The sedimentary facies is changing fastly; the reservoir is controlled by sedimentary facies, but the research area has not been studied for the regional carbonate sedimentary facies. Aiming at the above problems, this paper is in order to carry out the 3D poststack seismic data waveform analysis as auxiliary, using wells's log, logging division phase. At the same time, building the relationship of elastic wave impedance and lithology, then calibrating the body of prestack inversion elastic wave impedance. The attempt is made to study the seismic imaging in the study area, identifying the range of platform edge reef, patch reef and the bioclastic beach inside of platform. The favorable reservoir have been confirmed by drilling.
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