渤海海域太古界变质岩储层特征与形成控制因素  

Characteristics and controlling factors of Archean metamorphic reservoirs in Bohai sea area

作　　者：杜晓峰 刘晓健 张新涛 柳永军 徐燕红 DU Xiaofeng;LIU Xiaojian;ZHANG Xintao;LIU Yongjun;XU Yanhong(Bohai Oilfield Research Institute, CNOOC China Limited, Tianjin Branch, Tianjin 300459, China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459

出　　处：《中国海上油气》2021年第3期15-27,共13页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)”;中海石油(中国)有限公司“七年行动计划”重大科技专项“渤海油田上产4000万吨新领域勘探关键技术(编号:CNOOC-KJ 135 ZDXM 36 TJ 08 TJ)”部分研究成果。

摘　　要：渤海海域太古界变质岩分布面积广,已发现多个大中型油气田,勘探潜力巨大。本文基于上百口钻井的井壁取心、岩心和薄片等资料,对渤海海域太古界变质岩潜山储层特征进行了总结,对其形成主控因素进行了深入分析。研究表明,渤海太古界变质岩以片麻岩、变质花岗岩和混合岩为主,局部地区发育变粒岩和角闪岩,具有发育规模性优质储层的岩性基础;浅埋型潜山储层自上向下由黏土带、砂化带、砂化砾石带、裂缝带和基岩带构成,深埋型潜山自上而下由风化裂缝带、内幕裂缝带和基岩带构成。渤海海域太古界变质岩潜山优质储层形成整体受控于6个因素,构造应力控制了裂缝的形成,风化淋滤作用控制了风化壳溶蚀孔形成,古地貌控制了不同类型储层的分布部位,岩石类型控制了缝孔发育程度,深部热流体对储层具有双重控制作用,埋藏深度控制了优质储层的类型结构;优质储层形成是多因素综合作用的结果,不同埋深储层控制因素有所差异,其中浅埋型变质岩潜山储层受风化淋滤作用和古地貌因素影响较大,而深埋型变质岩潜山优质储层主要受构造作用控制,其次为岩性因素。本文对渤海海域太古界变质岩潜山储层特征与控制因素的研究成果,一方面丰富和完善了潜山储层研究相关理论认识,同时也为其他地区同类潜山储层评价提供了参考。Archean metamorphic rocks are widely distributed in Bohai sea area,and many large and medium-sized oil and gas fields have been found in this area,showing great exploration potential.Based on the data of sidewall coring,core and thin section from hundreds of wells,this paper summarizes the characteristics of Archean metamorphic buried hill reservoir in Bohai sea area,and deeply analyzes the main controlling factors of its formation.The results show that the Archean metamorphic rocks in Bohai sea area are mainly gneiss,metamorphic granite and migmatite with granulite and amphibolite developed locally,having the lithologic basis for developing large-scale high-quality reservoirs.Shallow buried hill reservoir is composed of clay zone,sandy zone,sandy gravel zone,fracture zone and bedrock zone from top to bottom,while deep buried hill reservoir is composed of weathering fracture zone,inner fracture zone and bedrock zone from top to bottom.The formation of Archean metamorphic buried hill reservoirs in Bohai sea area is controlled by six factors tectonic stress controls the formation of fractures,weathering and leaching control the formation of dissolution holes in weathering crust,paleogeomorphology controls the distribution of different types of reservoirs,rock types control the development of fractures and pores,deep thermal fluid has dual control on reservoirs,and burial depth controls the type structure of reservoirs.The formation of high-quality reservoir is the result of multiple factors,and the controlling factors are different for reservoirs with different burial depth shallow metamorphic buried hill reservoir is greatly affected by weathering&leaching and paleogeomorphic factors,while deep metamorphic buried hill reservoir is mainly controlled by tectogenesis,followed by lithological factors.In this paper,the research results on the characteristics and controlling factors of Archean metamorphic buried hill reservoir in Bohai sea area not only enrich and improve the theoretical understandings of buried hill re

关 键 词：渤海海域 太古界 变质岩 潜山 储层特征 控制因素 储层分带 风化淋滤 构造作用 

分 类 号：TE121.3[石油与天然气工程—油气勘探]