渤海垦利6-1新近系大型岩性油藏勘探发现与关键技术  

Discovery and key exploration technology of KL6-1 large lithologic oil reservoir of Neogene in the Bohai Bay Basin

作　　者：杨海风 牛成民 柳永军 高雁飞 张中巧 谢祥 王利良 Yang Haifeng;Niu Chengmin;Liu Yongjun;Gao Yanfei;Zhang Zhongqiao;Xie Xiang;Wang Liliang(Tianjin Branch of CNOOC(China)Co.,Ltd)

机构地区：[1]中海石油(中国)有限公司天津分公司

出　　处：《中国石油勘探》2020年第3期24-32,共9页China Petroleum Exploration

基　　金：国家科技重大专项“渤海海域勘探新领域及关键技术研究”(2016ZX05024-003);中海石油(中国)有限公司综合科研项目“渤海东部走滑断裂带控藏机理研究与有利勘探目标预测”(YXKY-2017-TJ-01)。

摘　　要：渤海湾盆地莱北低凸起构造背景和成藏模式认识不清是制约该区油气发现的关键因素。2019年以来,通过勘探思路转变,加强区内断裂构造、有利目标层系和油气富集规律研究,认为中生界顶部不整合面“汇聚脊”的发育部位控制新近系油气富集区带,微古地貌控制莱北低凸起明化镇组下段有利岩性圈闭的发育位置,油气主要富集在明化镇组下段Ⅴ油组顶部,并建立了基于岩性约束地质统计学反演的砂体定量刻画与流体识别技术。在新认识与新技术的指导下,成功转变勘探方向,揭示了新近系岩性油藏叠置连片成藏的新模式,使得莱北低凸起历经40余年勘探终获首个商业发现。垦利6-1油田为一整装的新近系优质大型岩性油藏,明化镇组下段Ⅴ油组顶部大型叠合连片砂体为其主力油层,油藏埋深主要为1200~1550m,且油层厚度一般大于8m;含油储层孔隙度为14.9%~39.8%,平均孔隙度为31.2%;渗透率分布于7.9~19721.3mD,平均渗透率为2205.52mD;钻杆测试结果显示,主力油层最高日产可超过180m3。The key factor restricting oil and gas discovery in Laibei low bulge in the Bohai Bay Basin is the unclear understandings on structural settings and hydrocarbon accumulation model.Since 2019,through the transformation of exploration ideas,researches on fault and structures,favorable objective strata and oil-gas accumulation rules in this area have been strengthened.It is considered that the development position of the“convergence ridge”of the top unconformity of Mesozoic controls the oil and gas accumulation of Neogene;the micro paleo-geomorphology controls the development position of favorable lithologic traps in the lower part of the Minghuazhen Formation in the Laibei low bulge;and the oil and gas are mainly enriched at the top of the V oil layer in the lower part of the Minghuazhen Formation.The quantitative description of sand body and fluid identification technology based on lithologic-constrained geo-statistical inversion are established.Under the guidance of new understandings and technologies,the exploration direction has been successfully changed,and the new model of superimposed and contiguous hydrocarbon accumulation in Neogene lithologic reservoir has been established,which makes the first commercial discovery in the Laibei low bulge after more than 40 years of exploration.KL6-1 oilfield is a large-scale high-quality integral Neogene lithologic oil reservoir,with the major oil layer of large-scale superimposed and contiguous sand bodies at the top of the V oil layer in the lower Minghuazhen Formation.The buried depth of the reservoir is mainly 1200-1550m,with oil layer thickness generally more than 8m.The porosity of the oil-bearing reservoir is 14.9%-39.8%,with an average of 31.2%.The permeability is 7.9-19721.3 mD,with an average of 2205.52mD.DST test results show that the maximum daily production of the maojr oil layer can be more than 180m3.

关 键 词：莱北低凸起 岩性油气藏 勘探历程 思路转变 勘探技术 

分 类 号：TE122.14[石油与天然气工程—油气勘探]