Characteristics and exploration significance of Ordovician carbonate reservoirs in the North Slope of Tazhong Lower Uplift,Tarim Basin
CHEN Xuan1, LIU Yin-he1, LIN Nian-tian2, ZHAO Zong-jv1, ZAHNG Bao-min1, YANG Hai-jun3, PAN Wen-qing3
1 State Key Laboratory of Enhanced Oil Recovery,Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China;
2 Shandong University of Science and Technology,Qingdao,Shandong 266510,China;
3 Exploration and Development Research Institute,Tarim Oilfield Company of PetroChina,Korla,Xinjiang 841000,China
Abstract：In this work,we divide the tectonic evolution of Tazhong area into three periods: the late middle-Caledonian cycle period,the late Caledonian kinematic period to the early Hercynian kinematic period and the Permian period.In the late middle-Caledonian cycle period,Tazhong area was evolved into the frontal uplift of foreland basin,which shaped the weathering crust with the period of 12.8Ma in the upper of Yingshan Formation.Tazhong Fault-belt No.1 oriented NW and its related secondary order faults accompanied with the right lateral extrusion started to play,which controlled the carbonate growing of Lianglitage Formation and formed the drowning unconformity between Lianglitage Formation and Sangtamu Formation.From the late Caledonian kinematic period to the early Hercynian kinematic period,the right lateral slip fault toward NE continued to move on.In the Permian period,the frequent volcano activity in Tarim Basin resulted in two large scale stocks in Tazhong Well 45 and Well 35,which associated with NE oriented magmatic intrusion.Through this tectonic evolution,it was identified tree types of reservoirs in Ordovician:the strike-slip faults-related paleocarst collapse reservoirs,the synsedimentary reverse faults-related inter-platform beaches reservoirs of Lianglitage formation and the igneous rock activity-related reservoirs.Carbonate high-quality reservoirs were formed by tectonic activity.These three types' reservoirs were different performances of different tectonic activity.They developed with the time and overlapped in the space.They were influenced with each other,which presented a relative independent carbonate paleokarst-fracture-cave system and indicated an important significance for exploration.
陈轩, 刘银河, 林年添, 赵宗举, 张宝民, 杨海军, 潘文庆. 塔中低凸起北斜坡奥陶系碳酸盐岩储层特征及其勘探意义[J]. 石油地球物理勘探, 2011, 46(3): 463-470.
CHEN Xuan, LIU Yin-he, LIN Nian-tian, ZHAO Zong-jv, ZAHNG Bao-min, YANG Hai-jun, PAN Wen-qing. Characteristics and exploration significance of Ordovician carbonate reservoirs in the North Slope of Tazhong Lower Uplift,Tarim Basin. OGP, 2011, 46(3): 463-470.
