| Abstract: | ![]()
The activities of deepfluid are regionalized in the Tarim Basin. By analyzing the REE in core samples and crudeoil, carbon isotope of carbon dioxide and inclusion temperature measurement in the west ofthe Tazhong Uplift in the western Tarim Basin, all the evidence confirms the existence ofdeep fluid. The deep fluid below the basin floor moved up into the basin throughdiscordogenic fauit and volcanicity to cause corrosion and metaaomatosis of carbonate rockby exchange of matter and energy. The pore structure and permeability of the carbonatereservoirs were improved, making the carbonate reservoirs an excellent type of deeplyburied modification. The fluorite ore belts discovered along the large fault and thevolcanic area in the west of the Tazhong Uplift are the outcome of deep fluid action. Suchcarbonate reservoirs are the main type of reservoirs in the Tazhong 45 oilfield. Thecarbonate reservoirs in well YM 7 are improved obviously by thermal fluid dolomitization.The origin and territory of deep fluid are associated with the discordogenic fault andvolcanicity in the basin. The discordogenic fault and volcanic area may be the pointer oflooking for the deep fluid modified reservoirs. The primary characteristics of hydrocarbonaccumulation in deep fluid reconstructed carbonate rock are summarized as accumulationnear the large fault and volcano passage, late-period hydrocarbon accumulation aftervolcanic activity, and subtle trap reservoirs controlled by lithology. |
