塔中泥盆系东河砂岩油气成藏及有利区预测

Hydrocarbon accumulation and favorable area prediction of Donghe Formation(D3d) in Tazhong area

结合塔中地区沉积构造特征,运用油源对比指标、油气包裹体镜下观察、均一温度测试以及饱和烃气相色谱分析等方法对塔中泥盆系东河砂岩的油气成藏特征进行了研究.研究表明泥盆系东河砂岩油气具有多来源、多期次成藏的特点.利用失利井分析资料,对泥盆系油气成藏的关键因素进行了确定,认为圈闭、储层物性、油源断层和保存条件是成藏的主控因素,并在此基础之上采用多因素叠合法对塔中泥盆系东河砂岩的油气成藏有利区进行了预测.预测结果认为泥盆系东河砂岩油气有利区主要沿塔中Ⅱ号断裂带分布,同时在塔中10号断裂带西部倾末端也有发育,这些地区为下一步油气勘探的有利区.

The characteristics of hydrocarbon accumulation in Donghe Formation(D3d) are studied according to the sedimentation and tectonic characteristics,oil-source correlation indexes,microscope observation and homogenization temperature testing of hydrocarbon inclusions and gas chromatogram of saturated hydrocarbon.The result indicates that hydrocarbon accumulation in D3d is characterized by multi-source and multi-period.Based on the analysis of the failure wells in D3d,it is held that the main controlling factors of the hydrocarbon accumulation are trap,reservoir property,oil source fault and preservation condition.The favorable areas for hydrocarbon accumulation in D3d are predicted using multi-factor superposition method.The prediction result shows that the favorable areas distribute along the Tazhong Ⅱfault belt and at the west end of Tazhong 10 fault belt.