石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (3): 673-689.doi: 10.11743/ogg20210313

• 油气地质 • 上一篇    下一篇

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

程鑫1,2(), 周立宏3, 操应长1,4,*(), 金凤鸣3, 付立新3, 李宏军3, 楼达3, 远光辉1,4   

  1. 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
  • 收稿日期:2019-03-04 出版日期:2021-06-28 发布日期:2021-06-23
  • 通讯作者: 操应长 E-mail:645719710@qq.com;cyc8391680@163.com
  • 作者简介:程鑫(1990—),男,博士研究生,油气储层。E-mail: 645719710@qq.com
  • 基金资助:
    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)

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

Xin Cheng1,2(), Lihong Zhou3, Yingchang Cao1,4,*(), Fengming Jin3, Lixin Fu3, Hongjun Li3, Da Lou3, Guanghui Yuan1,4   

  1. 1. Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong 266580, China
    2. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
    3. Dagang Oilfield Branch, PetroChina, Tianjin 300280, China
    4. Laboratory for Marine Mineral Resources, Qingdao, Shandong 266071, China
  • Received:2019-03-04 Online:2021-06-28 Published:2021-06-23
  • Contact: Yingchang Cao E-mail:645719710@qq.com;cyc8391680@163.com

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。

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

Abstract:

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 ℃).

Key words: buried hill classification, reservoir characteristics, origin of high-quality reservoirs, carbonate rock, Lower Paleozoic, Dagang prospecting area, Huanghua Depression

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