黄骅坳陷大港探区下古生界碳酸盐岩潜山差异演化及优质储层成因  

Differential evolution and origin of high-quality reservoirs in the Lower Paleozoic carbonate buried hills in Dagang prospecting area,Huanghua Depression

作　　者：程鑫[1,2] 周立宏 操应长[1,4] 金凤鸣[3] 付立新 李宏军[3] 楼达[3] 远光辉[1,4] Cheng Xin;Zhou Lihong;Cao Yingchang;Jin Fengming;Fu Lixin;Li Hongjun;Lou Da;Yuan Guanghui(Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China;Dagang Oilfield Branch,PetroChina,Tianjin 300280,China;Laboratory for Marine Mineral Resources,Qingdao,Shandong 266071,China)

机构地区：[1]中国石油大学(华东)深层油气重点实验室,山东青岛266580 [2]中海石油(中国)有限公司天津分公司,天津300459 [3]中国石油大港油田分公司,天津300280 [4]海洋矿产资源评价与探测技术国家功能实验室,山东青岛266071

出　　处：《石油与天然气地质》2021年第3期673-689,共17页Oil & Gas Geology

基　　金：国家科技重大专项(2016ZX05006-007);研究生自主创新项目(16CX06042A);大港油田公司与中国石油大学(华东)校企合作项目(DGYI-2016-JS-586)。

摘　　要：碳酸盐岩潜山储层成因及分布的复杂性制约了该类油藏的勘探。综合利用地震资料、岩心-薄片观察、测-录井分析、地化分析以及埋藏史分析等技术方法,从构造演化差异性角度对大港探区下古生界碳酸盐岩潜山进行分类,并开展了储集差异性和优质储层成因研究。大港探区下古生界碳酸盐岩潜山可以划分为残丘山、间断侵蚀断块山、断块山、挤压褶皱山和重力滑动褶皱山5种类型。残丘山为晚期大气水淋滤型储层,储集空间以岩溶孔、洞为主,发育少量裂缝;间断侵蚀断块山为中期大气水淋滤-深部溶蚀共控型储层,溶孔和裂缝均较发育;断块山、挤压褶皱山和重力滑动褶皱山未经历中、晚期表生淋滤,储层成因与断裂和埋深密切相关,可分为断裂破碎-深部溶蚀共控和断裂沟通-TSR溶蚀共控2种成因类型。前者在靠近基底断裂部分发育孔、洞、缝复合型储层,随着距基底断层距离增加,逐渐变为裂缝主导型储层,溶孔含量降低;后者主要发育在地温较高(>140℃)的深埋区,储集空间以裂缝为主,发育部分溶蚀孔、洞。上古生界缺失区、基底断层发育区和发育上古生界的深埋高温区(>140℃)可作为优质储层预测的有利指向。The exploration for carbonate reservoirs in buried hills has been hampered by a poor understanding of their distribution and genesis.With a combination of seismic profile interpretation,core and thin section observation,logging analysis as well as geochemical and burial history analysis,the types of the Lower Paleozoic buried hills,reservoir characteristics and genesis of high-quality reservoirs in Dagang prospecting area were studied from the perspective of evolutional difference.The buried-hills in the area can be classified into five categories:monadnock,intermittently eroded fault-block buriedhill,fault-block buried hill,compressional folded buried hill and gravitational sliding folded buried hill.The monadnock resulted from a late-stage meteoric water leaching is dominated by dissolution pores and cavities,followed by some fissures.The intermittently eroded fault-block,a result of middle-stage meteoric water leaching and deep burial dissolution,is full of dissolution pores and tectonic fissures.The last three buried hills that shunned the middle-or late-stage meteoric water leaching contain reservoirs linked to faulting and deep burial and formed either by fault-related shattering-deep burial dissolution or by fault connection-TSR related dissolution.The former forms mostly composite reservoirs with dissolution pores,cavities and fissures in areas close to basement faults and would gradually turn into tectonic fissure-dominated reservoirs as they migrate away from the basement faults.The latter forms reservoirs commonly seen in deep buried formations with very high temperatures(higher than 140℃).These reservoirs are mainly composed of fissures,followed by some dissolution pores and cavities.It is therefore suggested that high-quality reservoirs are most probably developed in areas with the Upper Paleozoic strata heavily eroded or basement faults well developed or with the Upper Paleozoic strata developed against a high temperature setting(higher than 140℃).

关 键 词：潜山分类 储集特征 储层成因 碳酸盐岩 下古生界 大港探区 黄骅坳陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]