涪陵地区上二叠统长兴组储层特征及有利区带分布

Reservoir Distribution Characteristics of the Upper Permian Changxing Formation in the Fuling Area

摘要: 四川盆地涪陵地区长兴组具有较高的资源潜力，本文主要结合最新钻井资料、薄片分析和野外露头观察，分析了涪陵地区的储层分布特征和影响储层分布的主要因素，并预测了涪陵地区有利储集区带分布。结果表明：涪陵地区有利储层主要为台缘带的礁滩储层，主要储层岩石类型为残余生屑白云岩、(残余海绵)细粉晶白云岩、生屑灰岩、白云质灰岩；主要储集空间类型为以次生孔隙占绝对优势，储集空间以粒间溶孔、晶间溶孔和溶洞为主，其次为晶间孔、晶模孔，少量裂缝；影响涪陵地区储层分布因素主要为沉积相带的控制和后期成岩作用的改造；长兴组涪陵地区划分出3个有利储集区，涪陵北部的兴隆1井–兴隆101井–兴隆3井–福石1井–福石2井区为最有利储集区。

Abstract: The Changxing Formation in the Fuling area of the Sichuan Basin has high resource potential. This paper mainly combines the latest drilling data, thin section analysis and field outcrop observations to analyze the reservoir distribution characteristics and the main factors affecting the reservoir distribution in the Fuling area. The results show that the favorable reservoirs in the Fuling area are mainly reef-shoal reservoirs in the platform margin zone, and the main reservoir rock types are residual bioclastic dolomite, (residual sponge) fine powder crystal dolomite, bioclastic limestone, and dolomitic limestone. The main reservoir space type is dominated by secondary pores, and the reservoir space is dominated by intergranular dissolved pores, intercrystalline dissolved pores and dissolved caves, followed by intercrystalline pores, crystal mold pores, and a small number of fractures; it affects the reservoir space in the Fuling area. The main factors of layer distribution are the control of sedimentary facies belt and the transformation of later diagenesis. There are 3 favorable reservoir areas in Changxing Formation Fuling area. The Xinglong 1 well-Xinglong 101 well-Xinglong 3 well-Fushi 1 well-Fushi 2 well in the north of Fuling are the most favorable reservoirs.