准噶尔盆地玛湖地区三叠系百口泉组优质储层预测

High-quality reservoir prediction for Triassic Baikouquan Formation in Mahu Depression,Junggar Basin

玛湖凹陷三叠系百口泉组为扇三角洲沉积,前缘亚相中优质储层发育,是油气主要集聚区,但由于钻井稀少,沉积相带横向划分不清,且单一弹性参数无法精细描述该层系优质储层,严重制约了该区油气勘探。基于GeoEast解释系统,利用频谱聚类法精细刻画地震相和沉积相,进而用叠前概率反演预测优质储层,在目标区优质储层预测中取得了良好的地质效果。

The sedimentary environment of Triassic Baikouquan Formation in Mahu Depression, Junggar Basin is delta deposits, and high-quality reservoirs were well-developed at delta-front facies,which is a main hydrocarbon accumulation area.These high-quality reservoirs are very difficult to be identified due to the unclear lateral distribution of delta-front facies and very few drilled wells. And only the single elastic parameter cannot distinguish theses reservoirs. To solve the problems we adopt a few interpretation tools provided by GeoEast interpretation sub-system. The spectrum clustering is used to depict seismic facies and sedimentary facies, and prestack probability inversion is applied to predict high-quality reservoirs. Our high-quality reservoir prediction achieves good geological results and is proved in the latter drilling.