特低渗碎屑岩储层评价方法研究——以安塞油田三叠系延长组长6油层组为例Research on Evaluation Methods for Extremely-Low-Permeability Clastic Rock Reservoir
——Taking the Chang 6 Reservoir of Yanchang Formation in Ansai District as an Example
纪璇, 徐岭灵, 龚福华, 尹梦莎, 刘子恒
特低渗, 安塞油田, 长6油层组, 储层评价Low-Permeability, Ansai Oilfield, Chang 6 Reservoir Set, Reservoir Evaluation
《Advances in Geosciences》, Vol.4 No.2, 2014-04-25
The characteristics of geological evolution in china determine that low-permeability oil and gas resource is abundant, widespread and has various types. In the rapid economic development of our country with energy shortage situation, intensifying the research and evaluation of low permeability reservoir, solving the problem of exploration and development of low-permeability reservoir, accelerating the increase in oil reserve and production to promote sustained and stable development of national economy have the realistic and scientific significance. Changqing Ansai oil field, the first large-scale development of low-permeability oil field, is a low-permeability oil field. In this paper, we take the Chang 6 reservoir of Yanchang Formation in Ansai district as an example to study low-permeability oil and gas distribution rules by depositional system. We can understand horizontal and vertical distribution of low-permeability reservoirs through refined sedimentary micro-facies analysis. The diagenetic evolution sequence and diagenetic facies distribution in the reservoir can be confirmed by the method of diagenesis analysis. Finally, through reservoir evaluation, we can recognize the reservoir pore structure and physical characteristics, establish the evaluation method of low-permeability reservoir and classification standard, optimize advantageous area and complete the reservoir prediction.