塔中地区奥陶系碳酸盐岩储层与油气聚集带

塔里木盆地塔中地区早中奥陶世为局限—开阔台地相碳酸盐岩沉积,晚奥陶世早期发展为半岛式的孤立台地,发育台缘礁滩相沉积。塔中地区经历了加里东中期—海西早期的抬升改造,发育多期不同程度的表生岩溶作用。在不同期构造沉积演化分析的基础上,提出奥陶系碳酸盐岩储层受构造古地理环境、沉积相组合、成岩改造期次等多因素综合控制,发育表生岩溶型、台缘礁滩型、白云岩型及热液改造型4种类型储层。根据储层成因类型及其展布,在塔中含油气区划分出上述4种类型的碳酸盐岩油气聚集带。 

HYDROCARBON ACCUMULATION ZONES OF ORDOVICIAN CARBONATE RESERVOIR IN TAZHONG AREA OF THE TARIM BASIN

Tazhong area of the Tarim Basin is restricted-open platform facies carbonate rock sediments from early to middle Ordovician.During the early stage of late Ordovician,the region develops to peninsula-like isolated platform and reef-band facies sediments along platform margin are deposited.Due to uplifts from middle Caledonian to early Hercynian,Tazhong area has experienced stages of supergene karst effects.Based on analysis of stages of tectonic evolution,it is pointed out that,Ordovician carbonate rock reservoirs in this region are controlled by palaeo-geography,sedimentary facies and diagenetic deformation stages.There are 4 types of reservoirs correspondingly: supergene karst,reef-band along platform margin,dolomite and hydrothermal deformation.Hence 4 types of accumulation zone are divided.