西藏南羌塘鄂斯玛地区中侏罗统布曲组沉积特征及油气地质意义

Sedimentary characteristics and oil-gas geological significance of the Middle Jurassic Buqu Formation in the Ersma area, Southern Qiangtang Basin, Tibet

通过沉积特征、沉积相及古地理分析,认为南羌塘鄂斯玛露头地区发育潮坪相、潟湖相、陆棚相沉积,江鱼玛洛覆盖区推测有障壁滩(或障壁岛)相沉积。根据沉积相的空间分布,研究区从北到南展布有隆起剥蚀区、潮坪相区、潟湖相区、障壁滩相区及陆棚-斜坡相区。根据以矿找矿思路,认为覆盖区的江鱼玛洛—额酥木玛障壁滩(或障壁岛)相区可能发育颗粒灰岩、白云岩储层。建议在江鱼玛洛—额酥木玛地区部署一口油气地质调查井,其有可能钻遇到含油白云岩或颗粒灰岩,并有可能实现油气资源的战略发现。

Through analyses of sedimentary characteristics, sedimentary facies and paleogeography, it is considered that tidal flat facies, lagoon facies and shelf facies occurred in the Ersma area and barrier beach facies occurred in the covered Jiangyumaluo area, southern Qiangtang Basin, Tibet. According to the spatial distribution of sedimentary facies, there were denudation area, tidal flat area, lagoon area, barrier beach area and shelf-slope area from the north to the south, respectively. It is considered that the granulated limestone and dolomite reservoirs may developed in the Jiangyumaluo barrier beach(or barrier island). It is suggested that an oil-gas investigation well should be deployed in the Jiangyumaluo-Ersumuma areas, which may drill into oil-bearing dolomite or granular limestone, and may reach the strategic discovery of oil and gas resources in the studied areas.