地质工程一体化实施过程中的页岩气藏地质建模

地质工程一体化强调地学研究与作业的互动,在中国地质条件复杂的非常规油气田,地质建模在数据基础和应用需求上体现出了独特的挑战。一方面,数据以水平井为主、数据量大且数据类型冗杂;另一方面,作业进程要求模型快速迭代甚至达到"适时"建模。因此如何充分利用多种数据快速建立高质量的地质模型至关重要,本文关注以页岩气藏为代表的非常规油气藏建模的独特性,并提出了具体流程和方法。其一,系统阐述了水平井地质建模流程,通过真厚度域旋回对比、二维导向剖面及井震数据融合从一维到三维解决水平井构造和属性建模难题。其二,以蚂蚁追踪为例介绍了天然裂缝预测与建模方法,非常规储层裂缝普遍发育,在理解裂缝发育背景的前提下通过成像测井、钻井、微地震等多学科资料的交叉验证有助于实现合理的裂缝建模。其三,不同应用需求下的地质建模流程与应用,如多学科集成的井位部署优化、适时建模支持地质导向以及压裂工程应用等。

Geological modeling of shale gas reservoir during the implementation process of geology-engineering integration

Geology-engineering integration emphasizes the interaction between geological research and engineering operation.In China,the geological conditions of unconventional oil and gas fi elds are complex.As a result,geological modeling faces unique challenges in terms of data foundation and application requirements.On the one hand,the data are mainly from horizontal wells,so the data volume is large and the types are miscellaneous.On the other hand,the model is required to iterate quickly or even a“timely”modeling during the operation process.Therefore,it is critical to make full use of various data to establish high-quality geological model quickly.This paper focuses on the uniqueness of unconventional reservoir modeling,taking shale gas reservior as an example,and proposes specifi c workfl ows and methods.First,the geological modeling workfl ow of horizontal well is systematically described.Through cycle correlation in true thickness domain,2D geo-steering section and integration of seismic and well data,the diffi culties of structure and attribute modeling of horizontal wells have been solved from one-dimension to three-dimension.Second,taking ant tracking technology as example,natural fracture prediction and modeling methods are summarized.Fractures are widely developed in unconventional reservoirs.Based on the understandings of geological settings of fracture development,cross-validation from multidisciplinary data,such as FMI logging,drilling and micro-seismic,is helpful to achieve a reasonable fracture modeling.The third is the geological modeling workfl ow and application under different application requirements,such as well deployment optimization,a timely modeling supporting the geo-steering and fracturing operation of multi-disciplinary integration.