准噶尔盆地玛湖凹陷风城组油藏地质特征和成藏规律
Geological Characteristics and Reservoir Formation Law of Fengcheng Formation in Mahu Depression, Junggar Basin

本文充分利用最新、最全的准噶尔盆地勘探和研究成果，深入分析玛湖凹陷风城组油气成藏地质条件，总结主要控藏因素和成藏规律。结果表明：风城组从玛湖凹陷边缘断裂带至凹陷中心区，依次形成了常规油藏、致密油藏和页岩油藏，源控特征十分明显，凹陷中西部油藏数量最多且储量大、东部斜坡区油藏很少。常规油藏类型主要为构造型、次为断层–地层复合型，分布于断裂带、鼻隆构造等，相对优质储层控制着原油富集和高产。玛南斜坡–百泉1井一带风城组属于异地生储致密油成藏模式，油源充足，勘探潜力大。玛北地区–凹陷中心区为风城组原地生储页岩油藏成藏，是页岩油勘探的重要区块。此外，玛北、玛湖和玛南风城组构造是寻找深层多类型油气藏的有利目标。
This paper makes full use of the latest and most complete exploration and research results in Junggar basin, it deeply analyzes the geological conditions of oil and gas accumulation in Feng-cheng Formation of Mahu sag, and summarizes the main reservoir controlling factors and reser-voir forming laws. The results show that from the marginal fault zone of Mahu sag to the central area of the sag, Fengcheng Formation successively forms conventional reservoir, tight reservoir and shale reservoir. The source control characteristics are very obvious. The number of reservoirs in the central and western parts of the sag is the largest and the reserves are large, and there are few reservoirs in the eastern slope area. Conventional reservoir types are mainly structural type, followed by fault stratum composite types, which are distributed in fault zone and nose uplift structure. Relatively high-quality reservoir controls crude oil enrichment and high production. The Fengcheng Formation in the area of Manan slope Baiquan 1 well belongs to the tight oil accumulation model of off-site source and reservoir, with sufficient oil source and great exploration potential. Mabei area—the central area of the depression is an important block for shale oil exploration, which is the in-situ source reservoir of Fengcheng Formation. In addition, the structures of Mabei, Mahu and Manan Fengcheng Formation are favorable targets for searching deep multi-type oil and gas reservoirs.