莺歌海盆地东方区黄流组大型强振幅体沉积内幕及其油气意义

doi:10.11743/ogg20180115

摘要/Abstract

摘要： 综合利用岩心、钻井、测井以及地震数据，系统查明了莺歌海盆地东方区黄流组一段大型强振幅体外部几何形态、内部沉积要素构成、发育期次、平面展布及演化规律，揭示了有利储集体特征与分布，探讨了其油气意义，并预测了东方区有利勘探方向。研究表明：大型强振幅体整体呈“扇形”，内部由浊积水道、水道间漫溢和天然堤3种沉积要素构成，为发育在浅海陆架背景下的大型“重力流沉积”。其垂向上可划分出3个期次，从第一期到第三期呈现出规模逐渐增大、向北西方向不断迁移、向南东方向逐步推进的演变趋势。浊积水道砂岩在东方区纵横广布、三期叠置，为该区主力储层类型。强超压环境对于改善东方区黄流组一段储集体物性具有重要促进作用。与大型强振幅沉积体相关的圈闭主要为砂岩上倾尖灭型岩性圈闭和砂岩透镜体型岩性圈闭，前者分布在底辟构造带的翼部（底辟活动区），后者主要位于底辟构造带外围（底辟活动波及区），勘探前景均十分广阔。

关键词: 强振幅体, 沉积内幕, 岩性油气藏, 莺歌海盆地, 南海

Abstract: Based on substantial cores, drilling data, well logging, 2-D and 3-D seismic data, the geometry, facies associates, depositional phases, distribution and evolution of the large-scale high-amplitude seismic reflection package in the 1st member of the Huangliu Formation of Dongfang area were studied.In addition, characteristics of the favorable reservoirs was revealed and its significance in hydrocarbon exploration was discussed.Finally, the exploration strategy of Dongfang area was suggested.The results show that the large-scale high-amplitude reflection packages were gravity flow fan deposit.It consists of turbidite channel fill, overbank deposits and levee.Furthermore, it can be subdivided into three phases vertically.From the first phase to the third, the fan size increased gradually, while the fan migrated toward northwest step by step, with concurrent movement in the direction of southeast.Turbidite channel sand fill bodies are the most important reservoirs in Dongfang area proved by drilling, which were widely distributed and three-phases superimposed.The overpressure played an important role to improve reservoir properties in the 1st member of the Huangliu Formation in Dongfan area.There are mainly updip pinchout lithologic reservoirs in the flaps of diapiric domes, and lenticular sandstone lithologic reservoirs in western Dongfang area which is not associated with diapiric domes.Both of them are associated with the large-scale high-amplitude reflection and have very great exploration potential.

Key words: high-amplitude seismic reflection, sedimentary characteristics, lithologic reservoir, Yinggehai Basin, South China Sea

中图分类号:

TE122.2

廖计华,吴克强,郭刚,等. 莺歌海盆地东方区黄流组大型强振幅体沉积内幕及其油气意义[J]. 石油与天然气地质, 2018, 39(1): 153-164. doi: 10.11743/ogg20180115 Liao Jihua,Wu Keqiang,Guo Gang,et al. Characteristics of the large-scale high-amplitude reflections and its significance in hydrocarbon exploration in the Huangliu Formation of Dongfang area of the Yinggehai Basin, South China Sea[J]. Oil & Gas Geology, 2018, 39(1): 153-164. doi: 10.11743/ogg20180115

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