| 许鹏,牛成民,李慧勇,张鑫,肖述光.渤海湾盆地渤中凹陷西南部变质岩潜山裂缝型储层特征及主控因素[J].矿产勘查,2022,13(4):418-427 |
| 渤海湾盆地渤中凹陷西南部变质岩潜山裂缝型储层特征及主控因素 |
| Characteristics and main controlling factors of natural gas fracture-related reservoir in Archen metamorphic rocks in southwest Bozhong Sag, Bohai Bay Basin |
| 投稿时间：2021-11-20 |
| DOI：10.20008/j.kckc.202204005 |
| 中文关键词: 渤海湾盆地 变质岩潜山 渤中19-6 裂缝储层 |
| 英文关键词: Bohai Bay Basin metamorphic rock buried hill Bozhong 19-6 fractured reservoir |
| 基金项目:本文受国家科技重大专项“渤海海域勘探新领域及关键技术研究(2016ZX05024-003)”资助。 |
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| 中文摘要: |
| 近年来,渤海油田针对渤海湾盆地渤中凹陷西南部深层太古宇变质岩潜山开展了勘探实践,成功发现渤中19-6大型整装凝析气田。目前,对于该气田优质裂缝型储集体发育控制因素认识不清,阻碍了下一步勘探进展。综合利用钻井岩芯、岩石薄片和成像测井等资料,对渤中19-6变质岩潜山裂缝型储层的形成机制进行研究。结果表明:渤中19-6构造带深层潜山储层是由太古宇变质花岗岩潜山为主体组成的立体网状裂缝型储集系统,上部形成风化裂缝带、内幕形成网状裂缝带的双层储层结构。上部风化裂缝带具有孔隙型和裂缝型的双重特性,下部内幕裂缝带以裂缝型储层为主。潜山风化裂缝带和内幕裂缝带储层的形成与分布均受控于3期构造活动的叠加作用,印支期以来是潜山裂缝的主要发育时期。由此建立了研究区太古宇潜山变质岩“优势岩性—多期裂缝”的成储模式。 |
| 英文摘要: |
| In recent years, Bohai oilfield has carried out exploration practice for the deep Archean metamorphic rock buried hill in the southwest of Bozhong Sag in Bohai Bay Basin, and successfully discovered Bozhong 19-6 large packaged condensate gas field. At present, there is no clear understanding of the control factors of the development of high-quality fractured reservoirs in the gas field, which hinders the next exploration progress. The formation mechanism of fractured reservoir in Bozhong 19-6 metamorphic rock buried hill is studied by comprehensively using the data of drilling core, rock thin section and imaging logging. The results show that the deep buried hill reservoir in Bozhong 19-6 structural belt is a three-dimensional network fracture type reservoir system mainly composed of Archean metamorphic granite buried hill. The upper part forms a weathered fracture zone and the inner part forms a double-layer reservoir structure of network fracture zone. The upper weathered fracture zone has the dual characteristics of pore type and fracture type, and the lower inner fracture zone is mainly fracture type reservoir. The formation and distribution of reservoirs in weathered fracture zone and inner fracture zone of buried hill are controlled by the superposition of three stages of tectonic activities. The main development period of buried hill fractures has been since Indosinian period. Therefore, the reservoir forming model of “dominant lithology multi-stage fractures” of Archean buried hill metamorphic rocks in the study area is established. |
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