准噶尔盆地玛湖凹陷风城组储层致密化过程与成藏模式研究 ——以玛西地区风二段为例
投稿时间:2023-12-20  修订日期:2024-01-19  点此下载全文
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作者单位邮编
李卉* 中国石油新疆油田分公司勘探开发研究院 834000
刘新龙 中国石油新疆油田分公司勘探开发研究院 
周作铭 中国石油新疆油田分公司勘探开发研究院 
阿不力孜·克力木 中国石油新疆油田分公司勘探开发研究院 
姜懿洋 中国石油新疆油田分公司勘探开发研究院 
任海姣 中国石油新疆油田分公司勘探开发研究院 
刘得光 中国石油新疆油田分公司勘探开发研究院 
李娜 中国石油新疆油田分公司勘探开发研究院 
马银山 中国地质科学院 
中文摘要:准噶尔盆地玛湖凹陷风城组作为全油气系统的典型实例,是未来规模油藏勘探开发的潜在区域。本文以岩心、铸体薄片及生产动态等资料为基础,明确了玛湖凹陷风城组储层致密化过程与油气成藏模式。取得认识如下:1)晚二叠世压实作用起主导作用,风二段盐类矿物、结晶白云石脱玻化作用形成较多微小孔隙空间;早三叠世有机酸溶蚀作用储层形成储层空间创造有利条件;早侏罗世白云化作用强烈,有机酸进一步溶蚀长石、碳酸盐矿物;2)晚二叠世风城组储层未致密,早三叠中后期部分岩相开始致密化,至早侏罗世开始大部分储层已致密,仅储层局部存在甜点区;3)晚二叠世成藏动力表现为浮力和生烃增压共同发挥作用,早三叠世纪以后逐渐以生烃增压为主要动力,发展成为源内-近源-源外的全油气系统成藏特点。通过上述研究,以期为玛湖凹陷风城组下一步油气勘探提供支撑。
中文关键词:准噶尔盆地  玛湖凹陷  风城组  成藏模式
 
Study on reservoir densification process and accumulation model of Fengcheng Formation in Mahu Sag, Junggar Basin:A case study of Section 2 Feng in Maxi Area
Abstract:As a typical example of the whole oil and gas system, Fengcheng Formation in Mahu Depression of Junggar Basin is a potential area for exploration and development of large-scale oil reservoirs in the future. In order to clarify the reservoir densification process and hydrocarbon accumulation model of Fengcheng Formation in Mahu Depression, this paper establishes the second Fengcheng Formation in geological history by using XRD, SEM and other experimental data based on core, cast thin slice and production dynamics. The following understandings have been obtained: 1) Compaction played a leading role in the late Permian, and the devitrification of salt minerals and crystalline dolomites in the second member of Fenghe formed more micro pore space; Early Triassic organic acid dissolution formed reservoir space and created favorable conditions. In the early Jurassic, the dolomitization was intense, and organic acids further dissolved feldspar and carbonate minerals. 2) The reservoirs of the late Permian Shifengcheng Formation were not dense, some lithofacies began to densify in the middle and late early Triassic, and most of the reservoirs became dense from the early Jurassic, with only local sweet spots. 3) In the late Permian, buoyancy and hydrocarbon generation pressurization played a role together. After the early Triassic century, hydrocarbon generation pressurization was gradually taken as the main driving force, and developed into the characteristics of the whole hydrocarbon system. Through the above research, it is expected to provide support for the next oil and gas exploration of Fengcheng Formation in Mahu depression.
keywords:Junggar Basin  Mahu Depression  Fengcheng Formation  Reservoir forming model
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