Dynamic Modeling Of Ordavician Pool-forming Model In Akekule Uplift

Analysis the former accomplishments of reservoir-forming modeling about the Akekule Uplift, based on the whole tarim basin modeling, the reservoir-forming course modeling was completed, reached the follow main results:1. Ordovician reservoir-forming modeling was the"Ordovician karst-gap and hole-structure composite reservoir-forming". It was classifid for three sub-model: early karst-gap, karst-gap addition rebuilding and later karst-gap. The sub-model of early karst-gap distributed in the 4and 6 area in heavy oil zone of Tahe oilfield, The sub-model of karst-gap addition rebuilding distributed in the mix reservoir in the south and east of Tahe oilfield, The sub-model of later karst-gap distributed in the condensate reservoir in the east of Tahe oilfield2. Oil and gas filling quantity was calculated by basin modeling of structural evolution and thermal history. The sources of Tahe oilfield was mainly from Cambrian-Ordovician marine facies hydrocarbon source rock in downslope nearby and oil generation depression, oil was mainly from Cambrian in the southwest.3. Three main oil and gas generation, discharge, migration and accumulation stage. The conclusion resolved the oil and gas resource and migration direction problem quantitatively. The most oil generation and discharge was Middle and later -Caledonian in the first stage, and was destroyed by erosion, oil and gas were mainly from Manjiaer depression in the southeast. The second stage was Middle and later Hercynian, the intensity of oil and gas generation was smaller, maybe was the main resource of the Akekule Uplift and Tahe oilfield. The third stage was Himalayan, mainly gas generation, oil generation was totally stopped, gas resource was in the south and southwest of the Akekule Uplift. This result resolved the problem of oil and gas resources quantitatively and the direction and quantity of migration and accumulation.4. By the modeling quantitatively, decreasing of the oil generation and discharge was related with the buried depth increasing of the depression around, since Middle-Caledonian stage, only the shallow buried area near the Akekule Uplift could continue generating oil. But the gas generation, discharge quantity was different, it increased remain after the Middle-Caledonian stage, and no mass filling because of the bad conducting.