裂缝性潜山变质岩储层地质建模方法——以锦州25-1S潜山为例

Geological Modeling of Fractured Buried Hill Mutation Reservoir:With JZ25-1S Buried Hill as an Example

针对裂缝性储层地质建模的难点和重点,在对渤海海域特殊变质岩潜山裂缝性油藏地质、物探、测井综合研究的基础上,针对国内外裂缝性储层地质建模的技术方法,提出了双重介质油藏储层的4步建模方法:①建立基质和裂缝共用的三维构造模型;②建立基质系统的属性参数模型;③建立裂缝网络几何模型,并将裂缝几何模型等效成裂缝参数定量模型;④动态校验模型。首次利用叠前地震反演资料做约束对裂缝发育的密度进行定量预测,并在此基础上根据成像测井解释的裂缝参数的统计规律对裂缝的三维分布进行预测,建立三维可视化的裂缝网络模型,将离散的裂缝网络转化为定量化的三维参数模型。以锦州25-1S油田裂缝性潜山基岩油藏为例,对裂缝性油藏(尤其是潜山油藏)的储层地质建模技术进行探讨和尝试。在对太古界潜山油藏构造、岩性、裂缝等精细描述的基础上,利用Fred和Petrel等先进地质建模软件建立了油藏的三维构造模型、裂缝空间展布及储层属性模型,对该裂缝性油藏进行了三维储层定量化表征,为该油藏开发方案的优化及实施奠定了基础。

Considering the complexity of the fractured reservoir characterization, based on current geological modeling methods and technologies for fractured reservoirs at home and abroad, a four-step geological modeling method is proposed for dual medium reservoirs, that is, a structure model to be used by the matrix system and the fracture system in the first step, petro-physical parameter models for the matrix system in the second step, a geometrical model for the fracture net and then a 3D parameter model in the third step, and a model to be checked with dynamic data in the fourth step. The forecast fracture density is used as a constraint condition for the pre-superimposition seismic inversion, and then, based on the detailed logging data, the special fractured buried hill mutation reservoir of Bohai sea area is analyzed. The 3D distribution of the fractures is forecast according to the interpretation results of the imaging logging, the 3D fracture piece model is visualized, finally the discrete fracture pieces are transformed into 3D continuous quantificational property models. With Jinzhou25-1S oilfield fractured buried hill mutation reservoir as an example, based on the elaborate description of structure, lithology and fractures of the fractured reservoir, the reservoir 3D models of structure, fracture distribution and properties are established by means of such modeling softwares as Fred, Petrel etc and the quantificational characters of the fractured reservoir are described.