东北长岭凹陷腰英台地区 低孔-低渗油层井中化探模式

油田区位于东北腰英台区域性隆起带,属构造复合性圈闭,岩性多为致密砂岩、细砂岩。油储层岩石孔隙度、渗透率普遍较低,属于低孔渗储层,储层为油水同层、含油水层。虽然在地质录井和气测录井中很难发现油水同层的低孔渗油气层,但是在井中化探录井中能发现它的特殊性,通过实践、研究、应用相结合,形成了如何判别油水同层的低孔渗油气层的井中化探录井新方法。

BOREHOLE GEOCHEMICAL EXPLORATION OF THE LOW POROSITY AND LOW PERMEABILITY RESERVOIRS IN NORTHEAST YAOYINGTAI AREA

The compound lithologic-structural oil reservoirs are located in Yaoyingtai regional uplift belt of Northeast China. Lithologically, there are mainly massive sandstones and fine-grained sandstones. The porosity and permeability of the reservoirs are generally quite low. The reservoirs consist of strata characterized by oil-water coexistence. The oil-water reservoirs of low porosity and permeability can hardly be discovered in geological exploration and borehole logging. Nevertheless, borehole geochemical exploration can reveal the features of oil-water coexistent strata. The authors combined the practice with research and application, and improved the recognition capacity steadily. As a result, a new borehole logging method has been established for recognizing oil-water coexistent reservoirs with low porosity and permeability.