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Abstract:
The reservoir properties in the Kalpin-Shaya uplift zone, Tarim basin, are a common concern with regards to petroleum exploration and reservoir evaluation alike. Dissolution and paleokarst have a positive impact on the porosity as well as the storage capacity of carbonate reservoirs because the secondary porosity related to dissolution and paleokarst serves as excellent traps for migrating hydrocarbons. In order to evaluate the reservoir characteristics reasonably in the late Precambrian and Ordovician carbonate rocks, the secondary porosity, which was produced by dissolution and paleokarstification in late diagenetic stage. should be studied because the primary pores were mostly destroyed during the early-middle diagenesis due to serious compaction and multi-cementation. Carbonate rocks ate among the most important collectors of oil and gas accumulations in the world Important oil and gas reservoirs in paleokarst-containing carbonate rocks are known worldwide because micropores and megapores, such as solution openings, solution fissures, funnels, sinkholes. and caves, serve as the fundamentally important secondary porosity in those rocks. Several wells revealed that the Kalpin-Shaya region is a prospective target for oil and gas exploration. The reservoir carbonates of the Kalpin-Shaya uplift zone in the northern Tarim include dolomites and limestones. The best dolomite reservoirs are in the late Precambrian Qigebulake Formation (Z(2)(2)), the lower Qiulitage Group (is an element of(2-3)), the upper Qiulitage Group (O-1(1)), smd the Xiaoerbulake Formation (is an element of(1)), whereas limestone reservoirs are in the middle-upper formations of the upper Qiulitage Group (O-1(2-3)). On the basis of the study of petrology, paleontology, and stratigraphy from field work and well core data, the pore spaces within the Precambrian and Ordovician carbonate reservoirs are studied with the aim of proving that all secondary pores are controlled by dissolution and paleokarst