塔里木盆地塔中隆起南坡上奥陶统礁滩相带的发现及油气勘探意义

DISCOVERY OF UPPER ORDOVICIAN REEF FLAT BELT AND SIGNIFICANT FOR HYDROCARBON EXPLORATION IN THE SOUTHERN SLOPE OF THE TAZHONG UPLIFT OF TARIM BASIN

从沉积演化研究入手,认为塔中南坡与北坡具有相似的构造和沉积演化背景;建立塔中北坡已发现礁滩相的地震解释模型,对南坡地震资料重新进行了精细解释,识别出塔中隆起南部斜坡具有与塔中隆起北坡相似的坡折带地震反射特征,发育大型台地边缘礁滩相沉积;在地震资料识别出的礁滩相带部署钻探了地质探井,发现了巨厚的海相地层礁滩相沉积,有望找到与塔中北坡坡折带类似的生物礁型亿吨级整装含油气新区带,油气勘探意义巨大。

Study results of sedimentary evolution indicate that the Southern Slope of the Tazhong Uplift is similar to the Northern Slope in tectonic and sedimentary evolution setting. The fine seismic reinterpretation is conducted on the Southern Slope by establishing a seismic interpretation for the discovered reef flat facies in the Northern Slope of the Tazhong Uplift. The interpretation results give seismic reflection signatures of a slope break belt in the Southern Slope that are similar to those in the Northern Slope, which correspond to massive platform edge reef flat deposits. A geological exploration well was drilled in the reef flat belt identified by seismic data, and consequently massive marine reef flat deposits were discovered. This promises a whole reef flat-type petroleum play as large as 100 MMT, similar to that in the Northern Slope,which is significant to hydrocarbon exploration.