川西新场地区须二气藏天然裂缝分布综合预测及评价(下)

DISTRIBUTION PREDICTION AND EVALUATION OF NATURAL FRACTURES IN 2nd XU MEMBER GAS RESERVOIRS,XINCHANG AREA,WEST SICHUAN BASIN

川西新场须二气藏天然裂缝发育,成因期次复杂,是影响开发产能的一个重要因素。通过对野外岩心、薄片中天然裂缝的调查、鉴定及统计等工作,对天然裂缝的发育特征进行了归纳和总结;从岩层厚度、构造变形、断层、岩性、物性等不同地质因素,分析了其对天然裂缝发育的控制作用,并了解了天然裂缝发育的主要控制因素。在天然裂缝特征、主控因素认识的前提下,通过对比分析单一因素裂缝预测结果与单井裂缝解释结果的吻合率确定了各因素的影响权值,并综合考虑主控因素建立了适合新场须二气藏天然裂缝分布预测综合评价因子。通过生产动态资料对裂缝分布预测结果进行了评价,吻合率达到80%以上,预测结果满足了开发应用的精度要求。

Natural fractures with complex formation periods are important factors to affect the development capacity in The 2nd Xu member in Xinchang area,west Sichuan basin.Based on the survey,identification and statistic of natural fractures in field,cores and thin section,the characteristics of the nature fractures are concluded and summarized.According with different geological factors such as bed thickness,structural deformation,faults,lithology,physical properties et al.to analysis those control of the natural fractures and figure out the main controlling factors of the natural fractures.Under the premise of the natural fracture characteristics and the main controlling factors,by comparing the results of single factor fractures predicting and the results of single well interpreting and considering the main controlling factors of the 2na Xu member in Xinchang area,a comprehensive evaluation factor of distribution predication of natural fractures is established.Evaluate the fractures distribution prediction resuits by the production performance data that tle consistent rate of them is more than 80% and the results are to meet the requirements of the development and application of precision.