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坪桥地区处于安塞油田的东部,占据了陕西省的安塞县和子长县境内的大约1800立方千米的土地面积。在坪桥地区中,由于湖盆三角洲的大面积的沉积形成了三叠系延长组地层。该地层中厚度较为统一,是一种砂岩互层。由于岩性的差异,在延长组中共分为五个岩性段。也正是由于在岩性,电性以及含油特点上的差异,总共划分了10个油层组,其中注重研究的以及目的层位长6油层组。本文在详尽的分析了岩心和测井资料的情况下,深入的研究和了解在安塞油田中坪桥地区长6油层组中的岩性的特征,沉积的构造,粒度的分布特点,泥岩的颜色以及相应的测井工艺。坪桥地区长6油层组的形成主要是由于三角洲前缘亚相沉积,再加上岩石的主要特征,沉积的微相特征,整体综合的考虑沉积的背景之后,建立一种在不同时期的沉积模式,包括指状,朵状以及坨状砂体模式,保障了储层中储集的相带预测。
The Pingqiao area is located in the east of Ansai Oilfield and occupies an area of about 1,800 km 3 in Ansai County and Zichang County in Shaanxi Province. In the Pingqiao area, the Triassic Yanchang Formation was formed due to the extensive deposition of the lake basin. The stratum is more uniform in thickness and is an interbedded sandstone. Due to the difference of lithology, there are five lithology segments in the extension group. It is also due to the differences in lithology, electrical properties and oil-bearing features that a total of 10 oil-bearing formations are grouped, with a focus on the study and the formation of the target reservoir. Based on detailed analysis of core and well logging data, the paper deeply studies and understand the characteristics of lithology, sedimentary structure and grain size distribution of Chang 6 oil layer in Zhongpingqiao area, Ansai Oilfield. Color and the corresponding logging technology. The formation of the Chang 6 reservoir in Pingqiao area is mainly due to the deposition of the delta front facies subfacies, together with the main features of the rocks and the microfacies of the sediments. After comprehensively considering the background of the sedimentation, a sedimentation at different stages Patterns, including finger, flower, and lump sand patterns, guarantee the prediction of facies accumulation in reservoirs.