TK625井区鹰山组碳酸盐岩储层精细对比研究

塔河油田鹰山组碳酸盐岩是塔河油田奥陶系油气藏主要产层，由于储层非均质性严重，长期以来对其连通性认识不清，严重影响到油田的合理开发。文章利用高频层序地层学理论分析了塔河油田TK625井区鹰山组上部的层序地层，将其划分为28个五级层序和4个四级层序。在单井高频层序地层划分和对比基础上，建立了高精度的层序地层格架，并在地层格架内开展储层的精细对比研究。结果表明：塔河油田鹰山组碳酸盐岩地层中的孔洞型储层，其分布与层序的形成密切相关，能够在高频层序地层格架内进行对比；而裂缝型储层是受后期构造应力作用形成的，横向变化快，相邻井间不具有对比性。

DELICATE CORRELATION STUDY ON CARBONATE RESERVOIRS OF THE YINGSHAN FORMATION AROUND TK625 WELL IN TAHE OIL FIELD

Carbonate rocks in Yingshan formation is the major production-layer for Ordovician oil/gas reservoirs in Tahe oil field, and its connectivity has not been recognized clearly because of the severity of the heterogeneity, so the development of the oilfield has been badly affected. High-frequency sequence stratigraphy is an available method to study the formation and distribution of carbonate rock. The upper Yingshan formation in Tahe oil field is analyzed in the light of the theory of high-frequency sequence stratigraphy; it is composed of 28 fifth-order sequences or 4 fourth-order sequences including two progradation parasequence sets and two retrogradation parasequence sets. On the base of division and correlation of high-frequency sequence in each well, the high-resolution sequence stratigraphic framework is established, and the carbonate reservoirs are correlated delicately in the stratigraphic framework. It is indicated that in the Yingshan formation of Tahe oil field, pore-type reservoirs related with sequence can be contrasted in the high-frequency sequence stratigraphic framework, on the contrary, crack-type reservoirs formed by structure stress are unable to be traced in contiguous wells.