MICROFACIES ANALYSIS OF THE MEMBER 1 OF QIGU FORMATION ON SANTAI UPLIFT OF SOUTHEASTERN JUNGGAR BASIN AND ITS SIGNIFICANCE FOR EXPLORATION
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摘要: 准噶尔盆地三台凸起上侏罗统齐古组一段(J3q1)沉积相类型一直较难确定,制约了油气勘探。充分运用地质、地震属性和地震反演等研究方法,综合分析认为研究区属冲积扇沉积,主要为扇中-扇缘沉积,并对扇中-扇缘沉积微相特征进行了分析,储层主要为辫状河河道砂体。对齐古组一段储层砂体属冲积扇扇中-扇缘沉积成因的新认识,有助于正确认识和预测储层分布及非均质性,确定潜在的勘探评价目标。在研究区周缘齐古组内以冲积扇扇中或扇缘为勘探和评价目标,有望发现岩性、构造或构造-岩性油气藏圈闭。Abstract: The facies of the Member l of the Qigu Formation (J3q1) in the central and western area of the Santai uplift of the south eastern Junggar Basin is still under debate, which constrains oil-gas exploration in the region to certain extent. In this article, methods of geology, seismic attributes, and seismic inversion are fully applied to define the facies. Data suggests that the Member l of the Qigu Formation (J3q1) is the products of a middle-distal alluvial fan, but not the facies of a braided river. The braided channel sandstone of the middle-distal fan is the main reservoir. The conclusion is helpful to map the distribution pattern and heterogeneity of the reservoir as well as the evaluation of the potential target. Favorable lithologic or fault-lithologic traps may occur in the proximal and distal parts of the fan system.
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Key words:
- alluvial fan /
- middle-distal fan /
- sedimentary environment /
- sedimentary microfacies /
- the Junggar Basin
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