地层超覆油藏勘探技术在陈家庄地区馆陶组的应用

通过地质综合分析,明确了陈家庄地区馆下段地层超覆油藏的油气分布规律主要受古地貌、地层超覆边界、岩性变化及储盖组合的控制,而地层和储层空间分布的定量解释是制约地层超覆油藏勘探的关键。根据该区馆下段地层超覆油藏的地质特征,应用相适应的勘探技术,对储层进行了定量分析,即应用残余厚度法、地震沿层切片等技术方法确定了古地貌特征及地层超覆线的位置;应用实际地质模型进行了正演计算,用来确定地层超覆上倾尖灭位置;在精细的测井资料校正基础上进行了测井波阻抗约束反演,用来确定储层厚度和预测孔隙度。应用上述技术方法最终完成了研究区储层厚度的定量解释、储层平面分布和储层孔隙度的预测,探明了馆陶组地层超覆油藏的规模,控制含油面积为33.2 km2,储量为4.740×107t;累积探明含油面积为20.6 km2,储量为2.807×107t,取得了显著的勘探效果和经济效益。

Application of exploration technology to stratigraphic overlap reservoir in Guantao formation of Chenjiazhuang area

Through the comprehensive geological analysis and seismic method,geologic characteristics and exploration technology were analyzed for the stratigraphic overlap reservoir in Guantao formation of Chenjiazhuang area.The results show that the reservoir is mainly controlled by the palaeogeomorphology,overlap boundary,lithological change and source-reservoir-cap.The quantitative interpretation for the stratum and the reservoir spatial distribution is the key to the reservoir exploration.Palaeogeomorphology characteristics and overlap of beds line position were obtained by residual stratum thickness and the technology of seismic horizon slice.The pinch-out position was determined by the actual geological model for forward computation.Based on the fine log information environment adjustment,the wave impedance constrained inversion was carried on to calculate reservoir thickness and to forecast porosity.Through the above technology,reservoir thickness quantitative interpretation of the research area,the reservoir plane distribution and the reservoir porosity forecast were finally completed.The oil deposit scale of Guantao formation was also verified.The control oil-bearing area is 33.2 km2 and oil geologic reserves are 47.4 million tons.The accumulation proving oil-bearing areas is 20.6 km2 and oil geologic reserves are 28.07 million tons.The remarkable exploration effect and the economic efficiency were obtained through the exploration technology.