下寺湾油田长8段致密砂岩油藏成藏条件及有利发育区预测

下寺湾油田在延长组下组合长8段致密砂岩油藏的勘探中有了新发现,但长8段致密砂岩油藏的研究程度相对较低,致密砂岩油藏的勘探未取得突破性的进展,为了进一步探明延长组长8段致密砂岩油藏的开发前景,根据岩心、钻井、测井及分析测试资料,深入分析了长8段致密砂岩油藏成藏条件。结果表明,研究区长8段致密砂岩油藏具有较好的成藏条件,油藏的形成和富集主要受沉积微相、烃源岩和优质储层的控制。综合分析认为,LP163-LP177井区和X41-X45井区成藏条件较好,可作为下一步的有利勘探开发区域。

Tight sandstone reservoir accumulation conditions analysis of Chang-8 member in Xiasiwan oilfield and favorable development zone prediction

A new discovery has been found in lower assemblage Chang-8 member of Yanchang formation in Xiasiwan oilfield,however,the research degree of tight sandstone reservoir in Chang-8 member is relatively lower and there is no breakthrough progress in tight sandstone reservoir exploration.In order to make clear the tight sandstone reservoir development prospects of Chang-8 member of Yanchang formation,according to the core,drilling,well logging and analysis of test data,the in-depth analysis of tight sandstone reservoir accumulation conditions has been carried out.The results indicate the tight sandstone reservoirs are of good accumulation conditions,the reservoir accumulation and enrichment are mainly controlled by sedimentary micro-facies,source rocks and high-quality reservoirs.Through comprehensive analysis,LP163-LP177 and X41-X45 well blocks are considered to be of better accumulation conditions,and can be taken as the favorable exploration and development area in the next step.