井震联合地质建模技术在扶杨油层油藏描述中的应用
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摘要
GTZ区块扶杨油层为网状河化的三角洲平原亚相沉积,储层砂体薄、相变快、规律性差,具低孔、低渗特点;砂岩的测井响应表现为高电阻率值与低自然伽马值,砂岩总体上为高速砂岩。由于上述地质、地球物理特征,进行精确油藏描述难度很大。本文通过井震联合地质建模技术,以地质资料和地震解释层位数据为基础建立了构造模型,采用相控技术和截断高斯及协序贯高斯模拟方法,得到了三维储层岩性和物性模型、油藏模型。对扶杨油层3个砂层组和7个小层的单砂体进行了厚度和含油性预测,预测结果与后验井验证结果符合率达到80%以上,油藏类型既有砂体上倾尖灭形成的岩性油藏,也有断层遮挡形成的构造—岩性油藏。
The Fuyang reservoir in GTZ Block is the braided river delta sub-plain facies sediment with thin sand layer,fast-changing facies,poor regularity,and low porosity and permeability,the well logging response for the sandstone shows high resistance and low natural gammy value,the sandstone can generally be regarded as high velocity rock.Due to the geological and geophysical characteristics above,it is very difficult to conduct accurate reservoir characterization for the sandstone.Through well-seismic joint geological modeling technique and based on the geological data and seismic horizons the structure model was established for the reservoir,by using phase-controlling technique and truncation Gauss and associated sequential Gaussian simulation methods,the 3D model for reservoir lithology and the physical property,and the reservoir model were established as well.The thickness prediction and reservoir prediction of the single sand body for 3 sand layer group and 7 sub-layers in Fuyang reservoir were conducted,by comparing with drilling data the accuracy of the prediction results reach up to 80%,the reservoir type including the lithology reservoir formed by sandbody pinching-out,and the structure-lithology reservoir formed by fault blocking.
The Fuyang reservoir in GTZ Block is the braided river delta sub-plain facies sediment with thin sand layer,fast-changing facies,poor regularity,and low porosity and permeability,the well logging response for the sandstone shows high resistance and low natural gammy value,the sandstone can generally be regarded as high velocity rock.Due to the geological and geophysical characteristics above,it is very difficult to conduct accurate reservoir characterization for the sandstone.Through well-seismic joint geological modeling technique and based on the geological data and seismic horizons the structure model was established for the reservoir,by using phase-controlling technique and truncation Gauss and associated sequential Gaussian simulation methods,the 3D model for reservoir lithology and the physical property,and the reservoir model were established as well.The thickness prediction and reservoir prediction of the single sand body for 3 sand layer group and 7 sub-layers in Fuyang reservoir were conducted,by comparing with drilling data the accuracy of the prediction results reach up to 80%,the reservoir type including the lithology reservoir formed by sandbody pinching-out,and the structure-lithology reservoir formed by fault blocking.
引文
[1]裘亦楠.储层地质建模十年.石油学报,2000,21(4):45～48
[2]刘文岭.地震约束储层地质建模技术.石油学报,2008,29(1):64～68
[3]魏嘉,唐杰,岳承祺等.三维地质建模构造技术研究.石油物探,2008,47(4):319～327
[4]汤军.对储层建模的研究.石油天然气学报,2006,28(3):50～52
[5]周丽清,赵丽敏,赵国梁等.高分辨率地震约束相建模.石油学报,2000,21(4):45～48
[2]刘文岭.地震约束储层地质建模技术.石油学报,2008,29(1):64～68
[3]魏嘉,唐杰,岳承祺等.三维地质建模构造技术研究.石油物探,2008,47(4):319～327
[4]汤军.对储层建模的研究.石油天然气学报,2006,28(3):50～52
[5]周丽清,赵丽敏,赵国梁等.高分辨率地震约束相建模.石油学报,2000,21(4):45～48
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