准噶尔盆地中部4区块油气成藏主控因素

Main controlling factors of hydrocarbon accumulation for Block 4
in central Junggar Basin

钱 志 金 强 王 锐 王圣柱

胜利油田分公司物探研究院，山东 东营 257022 中国石油大学地球资源与信息学院，山东 东营 257061 胜利油田分公司地质科学研究院，山东 东营 257015

Geophysical Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257022, China College of Geo-Resource and Information, China University of Petroleum, Dongying 257061, China Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

油源对比分析认为，准噶尔盆地中部4区块D1井侏罗系头屯河组超压油藏原油主要来源于下伏侏罗系西山窑组烃源岩。油藏与油源的分布特征表明：生烃和成岩等多种因素产生的穿层性超压而导致的层间、层内小断裂在油气垂向运移过程中起着重要作用，超压与断裂共同控制了油气的幕式运聚成藏，此外，该区继承性鼻状构造背景，也为油气聚集提供了有利条件。

Based on the oil-source correlation, the crude oil in overpressure reservoir of Toutunhe Formation of Jurassic, is mainly from the underlying Xishanyao Formation source rocks in Well D1 of Block 4 in the central part of Junggar Basin. The reservoir and oil-source
distribution characteristics show that the small interformational and intraformational faults, caused by the crossing -reservoir overpressure generated from hydrocarbon generation and diagenesis, plays an important role during vertical hydrocarbon migration. The overpressure and faulting control the episodic hydrocarbon accumulation together. In addition, the inherited nose structure provides an advantage for hydrocarbonaccumulation inthis block.