吴起油田白豹地区东部长8、长9储层特征研究

Study on Reservoir Characteristics of Chang 8 and Chang 9 in Eastern Bai Bao Area of Wuqi Oilfield

对鄂尔多斯盆地吴起油田白豹东部地区长8、长9储层进行储层特征研究。结果表明:白豹东部长8和长9储层的砂岩多为长石砂岩和岩屑长石砂岩;储层孔喉类型属于细孔粗喉,渗透率为强非均质型;长8砂体发育好,长9砂体发育程度差。同时储层敏感性研究表明:白豹项目区的长8、长9储层均为弱-中速敏、弱水敏和弱碱敏及中偏弱应力敏特征,但长8储层显示为弱酸敏,长9储层为强酸敏。

In this paper,the reservoir characteristics of Chang 8 and Chang 9 reservoirs in the east Baibao area of Wuqi Oilfield,Ordos Basin are studied.The results show that the sandstone of Chang 8 and Chang 9 reservoirs in east Baibao is mostly arkose and lithic arkose.The pore throat type of the reservoir is fine pore and thick throat,and the permeability is strong heterogeneous type.Chang 8 sand body is well developed,while Chang 9 sand body is poorly developed.At the same time,the reservoir sensitivity study shows that the Chang 8 and Chang 9 reservoirs in the Baibao project area are weak-medium velocity sensitive,weak water sensitive,weak alkali sensitive and medium weak stress sensitive characteristics,but the Chang 8 reservoir is weak acid sensitive and the Chang 9 reservoir is strong acid sensitive.