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北沟100井区位于下寺湾油田西北部,主要含油层位为三叠系延长组长2油层组,目前有采油井97口。本文以大量的岩心和测井资料为基础,结合现场的试油资料,以沉积学和油气地质学理论为指导,从储层特征、沉积微相和砂体的展布规律以及盖层的分布特征等方面深入分析了研究区长2油层组的成藏特征,研究结果表明,研究区主力油层长22-2储层岩性主要为灰色细粒长石砂岩,该时期发育的河道砂坝沉积微相为主要的砂体分布区,砂体呈北东南西向条带状展布,油层的分布与砂体的分布基本一致。根据以上的研究成果可以得出研究区油层分布主要受到沉积微相的控制,其次鼻隆带多为油藏富集的区域,以及有效盖层的分布也对油藏的分布具有重要的作用。
The northern well 100 borehole is located in the northwestern Xiahewan oilfield. The main oil reservoir is the Chang 2 reservoir of Triassic Yanchang Formation, and there are currently 97 oil wells. In this paper, based on a large number of core and well logging data, combined with on-site oil testing data, with the guidance of sedimentology and oil-gas geology theory, from the reservoir characteristics, sedimentary microfacies and distribution of sand bodies and distribution of caprock Characteristics of the reservoirs in this study. The results show that the main lithologic reservoir of Chang22-2 reservoir in the study area is mainly gray fine-grained feldspathic sandstone. During this period, the channel sand bar deposition The micro-facies is the main sand body distribution area, the sand body is distributed in the northeast, southwest and west, and the distribution of the oil layer and the distribution of sand body are basically the same. Based on the above research results, it can be concluded that the distribution of oil layers in the study area is mainly controlled by sedimentary microfacies. The second is the area where oil-rich reservoirs are mostly distributed and the distribution of effective cap rocks also plays an important role in the distribution of oil reservoirs.