准噶尔盆地中拐凸起东斜坡上乌尔禾组常规一致密油藏主控因素及成藏模式

Main controlling factors and accumulation model of conventional-tight oil reservoirs in the Upper Uerhe Formation of the eastern slope of Zhongguai Uplift, Junggar Basin

摘要

准噶尔盆地中拐凸起东斜坡上乌尔禾组油气资源丰富，是效益勘探及建产的重要领域。应用测录井、生产测试及岩心分析化验资料，研究中拐凸起东斜坡上乌尔禾组储层特征，明确储层差异性的主控因素，建立中拐凸起东斜坡常规一致密油藏序次分布的成藏模式。结果表明：自北部向南部，研究区逐步由常规油藏转化为致密油藏，沉积作用是造成储层差异性的物质基础，控制储层岩性及原始物性，压实作用和浊沸石胶结作用加剧储层常规一致密差异演化；研究区成岩相带划分为泥质充填带、贫泥-弱胶结带、浊沸石胶结带和强压实-弱溶蚀带 4 种相带，其中贫泥-弱胶结带为有利储层发育带。该结果为研究区致密油藏勘探提供指导。

Abstract

The Upper Uerhe Formation of the eastern slope of Zhongguai Uplift in Junggar Basin is rich in oil and gas resources, which is an important field for efficient exploration and production. By using well logging, production data and core analysis data, we studied the reservoir characteristics of the Upper Uerhe Formation in different structural locations on the eastern slope of Zhongguai Uplift, the main controlling factors causing the reservoir differences were identified, and the sequential distribution of conventional and tight reservoirs on the eastern slope of Zhongguai Uplift was established. The results show that the reservoir gradually transforms from conventional to tight, from the north to the south, the sedimentation is the material basis causing the reservoir differences, controlling the reservoir lithology and original physical properties, the compaction and turbidite cementation aggravate the evolution of the conventional-tight reservoir differences; the diagenetic facies zone in the study area can be divided into four types: muddy filling zone, poor mud-weak cementation zone, turbidite cementation zone and strong compaction-weak dissolution zone, among which the poor mud-weak cementation zone is the favorable reservoir development zone in the study area. The results have guiding significance for tight oil reservoir exploration.

关键词

准噶尔盆地 / 中拐凸起东斜坡 / 上乌尔禾组 / 常规储层 / 致密储层 / 储层特征 / 主控因素 / 成藏模式

Key words

Junggar Basin / eastern slope of Zhongguai Uplift / Upper Uerhe Formation / conventional reservoir / tight reservoir / reservoir characteristics / main controlling factors / hydrocarbon accumulation model

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基金资助

中国石油前瞻性基础性科技攻关项目(2021DJ0108)