黄骅坳陷孔南地区中下侏罗统储层特征及成藏组合模式

doi:10.3969/j.issn.1672-7703.2019.06.008

摘要/Abstract

摘要： 为解决黄骅坳陷孔南地区中生界中下侏罗统储层特征不落实、有利储集砂体分布规律不明显的问题，在综合利用大量测井、录井、岩心及分析化验资料的基础上，对中下侏罗统系统开展了储层特征、储集物性主控因素、有利区预测及成藏特征分析。研究发现，虽然孔南地区中下侏罗统储层物性较差，但是大量的岩石薄片表明，该区次生溶孔较发育，大大增强了储层的连通性，有效改善了储层物性，进一步研究表明次生溶孔较发育与有机酸酸溶关系密切，而有机酸产生与大断裂相关，在此基础上，明确有利的沉积微相类型及强烈的溶蚀作用是决定优质储层发育的主要因素；提出“近源—强联—直接输导型”和“远源—弱联—接力输导型”两类酸溶模式；利用“孔隙度—砂体有效厚度—埋藏深度—断层性质”四要素叠合评价，将有利储层发育区划分为Ⅰ1、Ⅰ2、Ⅱ、Ⅲ、Ⅳ五类，在Ⅰ1 类及Ⅰ2 类有利勘探区部署的多口探井获得工业油流，钻井成功率达70% 以上；依据烃源岩和储层的空间位置关系，将中下侏罗统划分为“源上”成藏组合和“源下—源侧”成藏组合，并探讨了两类成藏组合的特征及控制因素。

关键词: 黄骅坳陷, 孔南地区, 中下侏罗统, 储层特征, 有利区, 成藏组合

Abstract: In order to understand the characteristics of the Middle and Lower Jurassic reservoirs and the distribution law of the favorable sandstone reservoirs of the Mesozoic in the Kongnan area of Huanghua depression, the characteristics and controlling factors of the reservoirs were analyzed. Accumulation models were predicted for the favorable reservoirs using available well logging, mud logging, core data, and laboratory data. The results show that, although the reservoir physical properties are relatively poor, observation of many rock thin sections indicates that the secondary dissolved pores are well developed, which greatly improve the connectivity and physical properties of the reservoirs. Further studies suggest that the secondary dissolved pores are closely related to organic acid dissolution, and the source of organic acids is related to large faults. Finally, it is proposed that the favorable sedimentary microfacies and strong dissolution control the development of good reservoirs. There are two models of organic acid dissolution, “near source - strong relation - direct transport” and “far source - weak relation - relay transport.” The favorable reservoir zones are classified into five classes, I1, I2, II, III, and IV, based on the composite evaluation of “porosity - effective sandstone thickness - burial depth - fault properties;” according to the spatial configuration of source rocks and reservoirs, the Middle and Lower Jurassic accumulations are divided into “above source” and “under source – beside source.” Their controlling factors were also discussed. Multiple wells deployed in the classes I1 and I2 favorable zones have obtained industrial oil flow, and the drilling success rate was more than 70%.

Key words: Huanghua depression, Kongnan area, Mesozoic J1+2, reservoir characteristics, favorable zones, accumulation models

中图分类号:

时战楠, 蒲秀刚, 韩文中, 周静, 祝必兴. 黄骅坳陷孔南地区中下侏罗统储层特征及成藏组合模式[J]. 中国石油勘探, 2019, 24(6): 758-770.

Shi Zhannan, Pu Xiugang, Han Wenzhong, Zhou Jing, Zhu Bixing. Characteristics and Accumulation Models of Middle and Lower Jurassic Reservoirs in Kongnan area, Huanghua Depression[J]. China Petroleum Exploration, 2019, 24(6): 758-770.

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