海陆过渡相河道砂岩油藏地质地球物理综合评价

Comprehensive Analysis of Channel Sand Reservoir in Sea and Land Transitional Facies with Geophysical and Geological Data

阿尔及利亚三叠盆地HA-1区块T1储层勘探获得异常高产油气流。利用地质、测井、测试和地震资料分析该油藏的地质特点。测井与录井和取心资料综合分析表明石英砂岩是其主要储层,多井资料划分的沉积相以及测井曲线在平面上的分布特点,表明T1储层是曲流河的边滩沉积,平面上其分布特征表明河道在西部近北西向分布,在HA-1井区转向北东向发育。地震资料的波阻抗反演资料得出储层分布特点与该结论一致。套后测试的外推油藏压力明显小于裸眼井测试获得的油藏压力,说明该油藏在空间上分布有限。导数分析表明其也是具有封闭边界的油气藏,其距封闭边界的距离不足700m。多种资料综合研究表明HA-1井的T1油气藏是分布受曲流河边滩沉积微相控制、范围有限的砂岩油气藏。

In HA-1 faulted trap in Triassic basin of Algeria there is an abnormally high oil gas reservoir. The reservoir character is comprehensively studied with the geology, well logging, mud logging, well test and seismic data. The analysis of these data indicates that the reservoir is mainly characterized by the guartzose sand stone. Multi-well litho-face study reflects the sediment bar of meandering river environment with channel direction changes from approximately NW to NE near well HA-1. It agrees with wave impedance inversion of seismic data. Finally, the predic- tion is proved by reservoir boundary test and the reservoir is less than 700 m from the enclosed boundary. Thus, comprehensive studies have shown that T1 reservoir distribution in well HAd block is controlled by the beach sedimentary microfacies of meandering river, and it is a limited range of channel reservoirs.