川中地区茅二段储层测井评价及产能预测  

Well-logging evaluation and productivity prediction of Maokou 2 reservoirs in central Sichuan Basin

作　　者：赵艾琳 黄宏 谢冰 余广艺 彭骁 谭杰 ZHAO Ailin;HUANG Hong;XIE Bing;YU Guangyi;PENG Xiao;TAN Jie(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;Southwest Branch,China National Logging Corporation,,Chongqing 400021,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川省成都市610041 [2]中国石油集团测井有限公司西南分公司

出　　处：《天然气勘探与开发》2023年第4期116-122,共7页Natural Gas Exploration and Development

摘　　要：四川盆地川中地区中二叠统茅口组储层多发育在茅二段,具有岩性复杂、缝洞发育、非均质性强等特征,造成测井在储层识别、储层有效性评价等方面存在技术难点。早期基于单一储能系数指标的有效性评价,存在产能与储层参数不匹配的问题,通过对川中地区300余口钻遇茅口组的井开展测井老井再评价研究,基于白云岩发育程度、储层储集性、渗透性和缝洞发育程度等与储层有效性的单因素分析,构建RQ表征储层综合品质,并结合不同储层分类的厚度求取储层综合品质系数RPI,与测试产能建立关系。研究结果表明,①单一测井评价参数难以准确评价储层的有效性,需综合岩性、储集性、渗滤性等构建多参数储层综合品质评价模型;②储层厚度、Ⅰ+Ⅱ类储层厚度越大,测试产量就越高,将储层分类的厚度结合求取储层综合品质系数RPI,可提高产能预测准确度。通过求取的产能预测模型,优选潜力层,提出老井上试建议,有效的支撑了川中地区中二叠统茅口组增储上产和区带目标优选。Most reservoirs of the Middle Permian Maokou Formation in central Sichuan Basin are extended in Maokou 2 Member.They feature complex lithology,well-developed fractures and vugs,and strong heterogeneity,leading to challenges in identifying and evaluating them and their effectiveness through well logging.Dependent on one single index of storage coefficient,the past effective-ness evaluation might create the mismatch of productivity with reservoir parameters.So,some logging data of the Maokou Formation was re-evaluated for 300-plus wells in central basin.The effectiveness as one single index and the other four factors were analyzed in-dividually,including dolomite development degree,reservoir storability and permeability,and fracture or vug development degree.Af-ter that,the indicator was constructed for reservoirs to characterize their comprehensive quality.Coupling with the thicknesses of clas-sified reservoirs,the coefficient of comprehensive quality was determined to correlate with the tested productivity.Results show that(i)because one single parameter based on logging evaluation cannot achieve an accurate effectiveness,a multi-factor model should be built for the comprehensive quality by taking lithology,storability and permeability into account;and(ii)considering that larger thick-nesses of reservoirs and Class I+II reservoirs correspond to higher tested productivity,the thickness of classified reservoirs can be combined to determine,which helps improve an accuracy to predict the productivity.By using this prediction model established,some potential reservoirs may be optimized,and one testing suggestion for old wells is also proposed.These findings effectively support not only the improvement of both reserves and production but the optimization of target zones in the Middle Permian Maokou Formation of central Sichuan Basin.

关 键 词：四川盆地 中二叠统 测井评价 白云岩 储层综合品质 产能预测 

分 类 号：P631.81[天文地球—地质矿产勘探] TE151[天文地球—地质学]