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根据研究区140余口井的测井、录井及大量分析化验资料,结合各种相标志,利用沉积相综合研究方法系统划分了本区延长组长6油层组的沉积微相类型,分析了沉积微相与油气分布的规律。研究表明:本区长6油层组主要发育三角洲前缘亚相[1],微相主要为水下分流河道、河口坝以及分流间湾等。水下分流河道砂体垂向叠加,厚度较大,为油气富集的主要场所;通过对砂体展布特征的研究,为下一步的勘探开发提供了依据。
According to logging, well logging and a large amount of laboratory data from more than 140 wells in the study area and combining with various facies markers, the sedimentary microfacies types of Chang 6 oil layer of Yanchang Formation in this area are systematically analyzed by the comprehensive sedimentary facies research method. Sedimentary microfacies and hydrocarbon distribution. The results show that the Chang 6 oil layer mainly develops the delta front facies [1], and the microfacies are mainly underwater distributary channel, estuary dam and shunt bay. The submarine distributary channel sand bodies are superposed vertically and have a large thickness, which is the main site for oil and gas enrichment. By studying the characteristics of sand body distribution, it provides the basis for the next exploration and development.