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通过对研究区40余口井的测井、录井及分析化验资料资料的分析,结合沉积岩颜色、结构、构造等相标志,在单井沉积相分析的基础上,利用“点-线-面”相结合的沉积学分析方法,对志丹油田张柴窑子地区三叠系延长组长61、长62沉积体系进行了详细的划分。结果表明:本区长61、长62油层组主要为三角洲前缘亚相沉积,沉积微相包括水下分流河道、河口砂坝、分流间湾及水下天然堤。研究区水下分流河道和河口砂坝砂体垂向叠加厚度大,储集性能好,为研究区延长组油气富集的主要场所,通过对砂体展布特征的研究,为下一步的滚动勘探开发提供了依据。
Based on the analysis of well logging, well logging and analytical laboratory data of more than 40 wells in the study area and the phase identification of sedimentary rock color, structure and structure, based on the analysis of single well sedimentary facies, Surface "combination of sedimentology analysis method, Zhidan Oilfield Changchaoyaozi Triassic Yanchang Formation 61, 62 sedimentary system were divided in detail. The results show that the Chang 61 and Chang 62 reservoir groups are mainly delta front facies subfacies, and the sedimentary microfacies include underwater distributary channel, estuary sand dam, shunt bay and underwater natural dike. The sand bodies of submarine distributary channel and estuary sand bar in the study area are vertically superimposed with large thickness and good reservoir performance, which are the main sites for the enrichment of oil and gas in the Yanchang Formation in the study area. Based on the study of the distribution characteristics of sand bodies, Exploration and development provided the basis.