Genetic mechanism and prediction of Paleozoic clastic eureservoirs in platform of Tarim Basin  

作　　者：ZHU Xiaomin ZHONG Dakang ZHAO ChenglinGU Jiayu WANG Zhaoming ZHOU Xinyuan 

机构地区：[1]Key Laboratory for Hydrocarbon Accumulation Mechanism,Ministry of Education,University of Petroleum,Beijing 102249,China [2]Research Institute of Petroleum Exploration and Development,Petro-China,Beijing 100083,China [3]Tarim Petroleum Company,China National Petroleum Corporation,Korla 841000,China

出　　处：《Chinese Science Bulletin》2002年第S1期28-33,共6页

摘　　要：Based on the pore cast and cathodolumines-cence thin sections, diagenesis process, source rock matura-tion history, structural evolution and reservoir qualitycharacteristics, the points of view that the porosities of Pa-leozoic clastic eureservoirs in the platform of the Tarim Ba-sin are mainly secondary, and the dissolution plays anunignorable role in the formation of eureservoirs, are putforward. In this paper, a series of criteria for the recognitionof the secondary porosities, the occurrence extent and classi-fication of secondary porosity are introduced, and threekinds of dissolution mechanism-the aluminosilicate dis-solution, the silicon dioxide dissolution and the carbonatedissolution-to generate the secondary porosity are comeup with. The formation, distribution, preservation and dis-appearance of eureservoirs are controlled by the paleo-structural framework and evolution, and hydrocarbon fillingand discharging. Paleostructural framework manipulate themigration path and direction of the acid fluid so as to deter-mine the position and extent of the dissolution. Paleostruc-ture highs and continuous paleouplifts are in favor of devel-oping the secondary porosity. The hydrocarbon filling madethe secondary porosities preserved and the hydrocarbondischarging let the secondary porosities filled by later calciteor quartz overgrowth cements. Paleostructure highs andcontinuous paleouplifts during the maturation period ofCambrian, Ordovician and Carboniferous source rocks(corresponding to S, P and K) are main areas for eureservoirs developing.Based on the pore cast and cathodoluminescence thin sections, diagenesis process, source rock maturation history, structural evolution and reservoir quality characteristics, the points of view that the porosities of Paleozoic clastic eureservoirs in the platform of the Tarim Basin are mainly secondary, and the dissolution plays an unignorable role in the formation of eureservoirs, are put forward. In this paper, a series of criteria for the recognition of the secondary porosities, the occurrence extent and classification of secondary porosity are introduced, and three kinds of dissolution mechanism—the aluminosilicate dissolution, the silicon dioxide dissolution and the carbonate dissolution—to generate the secondary porosity are come up with. The formation, distribution, preservation and disappearance of eureservoirs are controlled by the paleostructural framework and evolution, and hydrocarbon filling and discharging. Paleostructural framework manipulate the migration path and direction of the acid fluid so as to determine the position and extent of the dissolution. Paleostructure highs and continuous paleouplifts are in favor of developing the secondary porosity. The hydrocarbon filling made the secondary porosities preserved and the hydrocarbon discharging let the secondary porosities filled by later calcite or quartz overgrowth cements. Paleostructure highs and continuous paleouplifts during the maturation period of Cambrian, Ordovician and Carboniferous source rocks (corresponding to S, P and K) are main areas for eureser voirs developing.

关 键 词：TARIM Basin eureservoir secondary POROSITY DISSOLUTION mechanism controlling factors prediction. 

分 类 号：P618.13[天文地球—矿床学]