致密储层物性下限研究——以川西新场大邑为例

LOWER LIMIT RESEARCH OF TIGHT SANDSTONE RESERVOIR

致密储层物性下限因储层致密、裂缝发育、试油气资料少而较难研究确定。通过对新场、大邑须二段致密储层及其裂缝发育特征的研究,分析了致密储层主要有孔隙型与裂缝-孔隙型两种不同类型的储层。以试气法研究确定新场须二段致密储层下限为基础,在对全直径产能模拟法进行理论分析基础上,通过新场、大邑地区样品实验分析,利用全直径产能模拟法对孔隙型储层与裂缝-孔隙型储层分别进行了储层物性下限研究与确定,明确了两种类型的储层物性下限是不同的。分析认为全直径产能模拟法可以研究确定致密储层物性下限,而且在缺乏试油气资料时极大地代替研究储层物性下限,为储层评价与钻采开发提供有价值的研究成果与技术支撑。

Lower limit research of tight sandstone reservoir is very difficult because of the tight reservoir, fracture development, lacking reservoir testing data. Through studying the characteristics of tight sandstone reservoir and fracture development in T3x2 formation of Xinchang and Dayi, the tight sandstone reservoir was divided into porosity and fracture-porosity reservoir. At first, using testing method confirmed the lower limit of tight sandstone reservoir in T3x2 formation of Xinchang structure, and based on the theoretical analysis of whole productivity simulation method, the lower limit of porosity and fracture-porosity reservoir was studied and confirmed, the difference of two reservoirs lower limit was analyzed. The analysis results showed that productivity simulation method could confirm the lower limit of tight sandstone reservoir. When testing data lack, it could provide technical director for reservoir evaluation and drilling development.