摘要
惠西南地区下文昌组是珠江口盆地重要的富油气勘探区之一,储量丰富,但地质探明率相对较低,缺乏定量综合分析与有利成藏区带预测。本文通过对其古隆起、构造脊、断裂、裂缝4个构造控藏要素进行定性、半定量分析,并综合预测有利勘探区带。研究结果表明:惠西南地区古隆起、构造脊、断裂与裂缝4个要素具有明显的控藏作用,每个要素均具有控藏门限。惠西南地区油气藏绝大部分分布在古隆起坡脚及以上,距构造脊顶点距离为1000 m以内,以断裂为中心5.5 km及裂缝发育密度为4~12条/m的位置。利用多要素门限叠合控藏作用原理,对研究区有利勘探区带进行了预测,西江23东洼、西江24洼、西江30洼转换带与惠州26洼西南侧斜坡带为惠西南地区下文昌组有利勘探区。
The lower Wenchang Formation in southwestern Huizhou sag is one of the important hydrocarbon-rich exploration areas in the Pearl River Mouth Basin with abundant reserves but relatively low geological proven rate,and there is a lack of quantitative comprehensive analysis and favorable reservoir-forming zone prediction.In this paper,four reservoir-controlling structural elements of paleo-uplift,structural ridge,fault and fracture were qualitatively and semi quantitatively analyzed,and the favorable exploration zones were comprehensively predicted.The results indicate that paleo-uplift,structural ridge,fault and fracture are four obvious reservoir-controlling elements with reservoir-controlling thresholds in southwestern Huizhou sag.It is found that most hydrocarbon reservoirs are distributed on the slope toe of the paleo-ridge and above,with a distance of 1000 m to the structural ridge,within a rank of 5.5 km from fault center and with a fracture density of 4~12 fractures/meter in southwestern Huizhou sag.Based on reservoir controlling function of the superimposed multi-element threshold,the favorable exploration zones in the study area are predicted,and the transform zones of Xijiang 23,Xijiang 24 and Xijiang 30 sags and the southwest slope zone of Huizhou 26 sag are predicted to be favorable exploration zones in the lower Wenchang Formation in southwestern Huizhou sag.
作者
郭勃巍
于福生
李洪博
李晖
于飒
吴哲
GUO Bowei;YU Fusheng;LI Hongbo;LI Hui;YU Sa;WU Zhe(College of Geosciences,China University of Petroleum,Beijing,Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,Beijing 102249,China;CNOOC China Limited,Shenzhen Branch,Shenzhen,Guangdong 518000,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2022年第6期34-43,共10页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司深圳分公司综合科研项目“浅水区古近系‘源-汇-聚’综合评价及大中型油气田勘探方向研究(编号:CCL2020SZPS0143)”部分研究成果。
关键词
控藏构造要素
半定量分析
有利区带预测
下文昌组
惠西南地区
reservoir-controlling structural elements
semi-quantitative analysis
favorable zone prediction
lower Wenchang Formation
southwestern Huizhou sag
