Hydrocarbon accumulation and distribution in lower Paleozoic carbonates in Tarim Basin

摘要

Carbonates are the main exploratory layers in Tarim Paleozoiccratonic basin. With abundant oil and gas sources, the lowerPaleozoic carbonate in which traps develop over a large area and at ahigh amplitude, has the basic condition to form large oil and (or)gas fields. Three types of petroleum accumulation models, whichconsist of buried-hill petroleum accumulation in the high part of theuplift, inner structure petroleum accumulation in the pitching partof the uplift and fault horst petroleum accumulation on the border ofthe uplift, are found in the lower Paleozoic carbonates. Petroleumoccurrence is mainly controlled by paleo-uplift, fault, unconformityand fracture system. The pitching part of the paleo-uplift and thefault belts on the paleo-uplift are the favorable exploratory areas.