北部湾盆地涠西南凹陷D洼新近系稠油成因及资源潜力分析

Genesis and Resource Potential Analysis of Neogene Heavy Oil in D Sub-sag, Weixinan Sag, Beibuwan Basin

戚家振 黄建军 杨鹏程 刘峰 黄苏卫 黄家琳 陈现

QI Jiazhen HUANG Jianjun YANG Pengcheng LIU Feng HUANG Suwei HUANG Jialin CHEN Xian

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院，上海　200120

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

北部湾盆地涠西南凹陷自开展油气勘探活动以来，在主洼先后发现多个油田，而D洼勘探直到近几年才取得突破性进展。针对D洼的研究尤其是对新近系浅层首次发现的稠油油藏缺乏认识的问题，该文利用新井资料及周边区域地质资料，运用地球化学及成藏等综合分析方法，对涠西南凹陷D洼稠油特征、成因机制及主要成藏条件进行了系统的研究分析，取得了一系列的研究成果。研究发现D洼稠油为生物降解形成的高密度、高黏度、高沥青质、低含硫含蜡次生稠油。同时利用其成藏机理预测了整个D洼新近系浅层可能存在的含油气圈闭，研究成果对今后在涠西南凹陷D洼浅层勘探具有重要的理论指导意义。

Since the oil and gas exploration activities were carried out in Weixinan Sag of Beibu Gulf Basin, several oilfields have been found in the main depression, while the exploration of D Sub-sag has not made a breakthrough until recent years. The research on D Sub-sag, especially the first discovery of the heavy oil reservoir in Neogene, is lack of knowledge. In view of this problem, the characteristics, genetic mechanism and main reservoir forming conditions of the heavy oil in D Sub-sag of Weixinan Sag are systematically studied and analyzed by using new well data and regional geological data, geochemical and reservoir forming methods, and a series of research results are obtained. It is found that the heavy oil in D Sub-sag is the secondary heavy oil with high density, high viscosity, high asphaltene, low sulfur and wax content. At the same time, potential hydrocarbon traps of the whole D Sub-sag in Neogene are predicted by using the reservoir forming mechanism. The research results have important theoretical guiding significance for the future shallow exploration in D Sub-sag of Weixinan Sag.

中国石化股份公司油田事业部重大勘探导向项目，海域探区区带评价与突破目标优选（YTBXD-01-SH12-2019）

https://doi.org/10.3969/j.issn.1008-2336.2022.01.013