塔河油田TK7226井区河道砂岩性油藏滚动开发实践及认识

Rolling Development Practice and Understanding of Channel Sandstone Reservoirs in Wellblock TK7226 of Tahe Oilfield

结合塔河油田TK7226井区钻井、试油、试采等资料,利用地质学、地震学的方法对塔河油田TK7226井区开展地质特征综合研究。结果表明,研究区主要发育辫状河三角洲前缘沉积,水下分流河道和河口砂坝为主要的储集砂体,属于中孔-中渗储层,断裂是油气成藏的主控因素。通过分析河道砂岩性油藏与断层的关系,认为其具有"垂向调整、侧向运移、断裂控藏"的成藏特征,并总结出河道砂含油气判别的3种方法,在开发实践中效果显著,对同区及同类河道砂岩性油藏的开发具有一定指导意义。

According to the data of drilling,oil test and production test from Wellblock TK7226of Tahe Oilfield,a comprehensive research was carried out on geological characteristics of the wellblock by means of geologic and seismologic methods.The result indicated that braided-river delta front sediment was mainly developed in the studied area,the main reservoir sands were underwater distributary channel and mouth bar.It belonged to a medium porosity and medium permeability reservoir.Fracture was the major factor controlling the hydrocarbon accumulation.By analyzing the relationship between channel sandstone reservoir and fault,it is considered that the reservoir has the hydrocarbon accumulation characters,such as'vertical adjustment,lateral migration,and fracture controlling',and three methods are summed up for identifying oil and gas in channel sands,and obvious result is obtained in operation.It provides certain guidance for reservoir development of the same channel sandstone in the same area.