摘要:
北美某盆地晚白垩世为浅海环境,其中发育的A层是白垩与泥灰岩的厚层互层沉积,页理发育,是美国主要的页岩油气产层之一,在盆地南部现今发育有8个页岩油田。通过Z区块内的钻井产量差异性分析,以及地层的埋深、厚度、Ro、TOC和脆性度对比,认识到生产井产量与Ro呈正相关性,裂缝发育的地区利于生产井产量的提高,多数高产井分布在岩石脆性程度较大的地区。基于以上分析,将该盆地页岩油气核心区的评判地质参数确定为Ro、裂缝带、岩石脆性程度和构造复杂程度,以此在Z区块内划分为4个分区,I类区最好,IV类区最差。
关键词:
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页岩油气
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产量
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地质因素
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核心区
Abstract:
We studied in this paper the shale oil basin located in the west of the USA filled with shallow marine sediments of K2, of which the Formation A is the most popular shale oil production target in North America. The Formation consists of interbedded chalk and marl. Until now, eight shale oil fields have been discovered in the south of the basin, and are now in the development phase. We studied the production difference in the Z block of the basin and its relation with depth, thickness, Ro, TOC and brittleness through well data and seismic data. We found that the Ro has positive correlation with production, and fracture belt can help well increase in production. The best production wells are located in the area where the sediments are more brittle. Our data suggest that four geologic parameters, i.e. Ro, fracture belt, brittleness and structure complex, are critical for evaluation of production potentials. And according to the four parameters in the core area, the Z block could be divided four parts. The tier I is the best and the tier IV the worst.
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