塔北隆起中、新生界陆相碎屑岩储集层特征及评价

塔北隆地优质储集层的分布区控制了该区油气的分布。根据大量岩心的物性检测资料,对塔北隆起第二系——三叠系的碎屑岩储集层进行评价。储集层岩性以长石砂岩,岩屑砂岩为土,物性总体较好,以高孔—中,高渗及中孔—中渗为主,仅侏罗系储集层物性总体偏差,储集层评价以较好、中等储集层为主。其中,新近系与油 组优质储集层分布于塔北的东部地区,吉近系苏维依组优质储集层分布于东部及北部地区;白主系优质储集层主要分布于西部的羊塔克地区、英尺7井区、红旗区带侏罗系储集层物性下部好于上部,哈拉哈塘凹陷储集层较好;三叠系储集层较侏罗系储集层好,优质储集层分布于塔北中部轮南地区、中东部草湖凹陷及西部地区的南部地带。图1表5参4。

Characteristics and evaluation of Mesozoic and Cenozoic clastic reservoirs in the Tabei Uplift

The distribution of the oil/gas field is controlled by the high quality reservoirs in the Tabei Uplift. According to large amount of data of physical properties of the cores, the Tertiary Triassic reservoirs in the Tabei Uplift are evaluated. Reservoir lithology is mainly feldspar sandstone and lithic sandstone, and the physical properties of the reservoir are favorable, mainly high porosity with middle to high permeability and middle porosity with middle permeability. As a whole, only the physical properties of the Jurassic reservoir are low. The evaluation shows that reservoir belongs to good or middle grade, high quality reservoir distributes wide in the Tabei Uplift, Tarim Basin. High quality reservoir of Neogene is located in the east of Tabei Uplift, and Paleogene in the east and north of Tabei Uplift. High quality reservoir of Cretaceous is situated in the Yangtake area, Yingmai 7 area and Hongqi area in the west of Tabei Uplift. The high quality Triassic reservoir developed in the middle of Tabei Uplift and south area in the west of Tabei Uplift.