【摘要】 王73地区沙四段油气藏类型主要以岩性和构造-岩性油气藏为主,滨浅湖相的滩坝砂体是最主要的油气储集体,岩性以灰质、泥质粉细砂岩为主。储层横向变化大,围岩中普遍含有灰岩,使得砂、泥岩速度差异减小,利用传统的稀疏脉冲反演和基于模型反演的方法不能对储层进行有效预测。为此,首先利用岩石物理学方法,对研究区储层的岩性、物性、含油气性与地震属性之间的关系进行了分析研究;然后利用地震属性技术提取了对刻画砂体和扇体边界较敏感的均方根振幅属性、时差属性和瞬时相位相干属性,对储层的空间展布特征进行描述,预测了油气勘探的有利区域;最后应用井震结合的外漂克立金技术对王73地区沙四段纯下2砂组的厚度进行了估算。根据预测结果,在油气勘探有利区域部署了一口钻井,钻遇的纯下2砂组厚度与预测厚度一致。更多还原

【Abstract】 The hydrocarbon reservoir of Es4 in Wang 73 area is domina- ted by lithologic reservoir and structural-lithologic reservoir.The beach-dam sandstone of offshore lake facies is the main accumula- tion unit with the lithology being calcareous and argillaceous silt- stone.The great horizontal change of the reservoir and the wide distribution of limestone in surrounding rocks decrease the differ- ence in velocity between sand and shale,which,in turn,makes the traditional sparse impulse inversion and model-based inversion not effective in the reservoir prediction.Therefore,petrophysics is used to analyze the relationship among seismic attributes and lithol- ogy,physical property,hydrocarbon property.Then,the seismic attribute technology is used to extract root-mean-square amplitude, moveout,and instantaneous phase coherent property,which are sensitive in portraying the boundary of sand and fan body;at the same time.the distribution of reservoir is described,and the po- tential zone of hydrocarbon exploration predicted.Finally,well- seismic-based ex-drifting kriging technology was applied to estimate the thickness of Chunxia 2 sand set of Es4 upper member in Wang 73 area.In terms of the predicted results,one drilling well was de- ployed in the potential zone and the drilled thickness of Chunxia 2 sand set is coincide with the predicted thickness.更多还原