KARSTIFICATION MODELS OF THE ORDOVICIAN CARBONATES AND THEIR INFLUETIAL FACTORS IN THE TAHE OILFIELD, THE TARIM BASIN

Karstification research of a complicated anisotrophic carbonate reservoir is presently an important leading field for reservoir sedimenology and geochemistry.Akekule convex included Tahe Oilfield is a long-term developed paleo-uplift based on the pre-Sinian metamorphic basement,which affected by multi-period of Caledonian and Hercynian tectonic uplift and sea-level changes,and superposing reformed by late tectonic movement.A set of Cambrian-Ordovician carbonate karst-fracture-hole reservoirs were developed in Akekule convex.Combined with the karstification and exploration in Tahe Oilfield,three karstification models were established in the area and the key controling factors of karst development were analyzed.