准噶尔盆地阜东斜坡区齐古组沉积相及有利储集相带

Sedimentary Facies and Favorable Reservoir Facies of Qigu Formation in Fudong Slope Area of Junggar Basin, NW China

摘要

准噶尔盆地阜东斜坡区齐古组具有较大的油气资源勘探潜力,但沉积相带系统认识的欠缺制约着勘探开发进程.本研究通过野外露头、岩心描述,以及大量薄片、重矿物、地球化学、钻测井和地震等资料,对准噶尔盆地阜东斜坡区齐古组沉积相进行精细刻画,并对该区有利储集相带进行探索.结果表明:齐古组时期,北部克拉美丽山、南部博格达山及东部北三台凸起共同为研究区提供物源;齐古组主要发育辫状河三角洲,按沉积特征可划分为三角洲前缘和平原两个亚相,以及若干微相.对沉积相平面分布进行绘制,确定有利储集砂体分布规律;通过沉积相的空间分布研究,明确对齐古组储集层的控制作用,认为齐古组初期水下分流河道、距离较大断裂和地层剥蚀区域较近的较厚分流河道微相为有利储集相带,具备形成岩性油气藏条件.

Abstract

It has a great potential for oil and gas resources exploration in Qigu Formation of Fudong slope area, Junggar basin, and the exploration and development process has been restricted due to a lack of system understanding of sedimentary facies. In order to gain a detailed understanding of the sedimentary facies and identify the favorable reservoir facies, many data, such as field outcrops, cores and sections observation, analysis on heavy minerals and geochemistry, drilling, logging, and seismic data were used. The results show that: The provenances of Qigu Formation are the northern Karameili Mountain, the southern Bogda Mountain, and the eastern Beisantai salient. A braided delta deposit dominated the Qigu Formation, which can be divided into two subfacies (delta plain and delta front) and several microfacies based on sedimentary characters. Based on seismic attributes and sand contents, the favorable sand bodies are characterized. Favorable sandbodies and oil-bearing properties in Qigu Formation are predicted through space distribution analysis of sedimentary facies. Underwater distributary channels in the initial stage of Qigu Formation, distributary channels near deep fault or denudation areas are favorable reservoir facies belts for the forming of lithological accumulations.

关键词

准噶尔盆地 / 阜东斜坡区 / 齐古组 / 沉积相 / 有利相带 / 油气 / 岩性油气藏

Key words

Junggar basin / Fudong slope area / Qigu Formation / sedimentary face / favorable reservoir facies / oil and gas / lithological oil and gas reservoirs

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基金资助

中国石油天然气集团有限公司“十四五”前瞻性基础性科技项目(2022DJ7901)

新疆维吾尔自治区天山英才项目(2023TSYCJC0010)

新疆维吾尔自治区克拉玛依市创新人才项目(2025DB0156)