非常规致密储层通常具有非均质强、资源丰度低、低孔隙度、低渗透率的特点。相较于陆地非常规储层，海上致密气藏水力压裂作业安全风险更大，作业难点更多，储层的均衡改造受到限制。因此，海上致密气藏部署长水平井进行水力压裂开发，需要精准评价储层地质力学特征，分析水平井段的可压裂性，在地质力学相近的井段进行压裂，可为海上气藏的精准、均衡和效益开发提供支持。以海上致密气藏为研究对象，建立了基于脆性指数和地应力差的工程可压裂性分析方法，采用核密度估计方法预测工程可压裂性密度函数和累积概率函数，建立了工程甜点预测模型。基于工程甜点的预测，对水平井进行了分段优化，实现段间距的差异化设计。基于地质工程一体化理念，进行了压裂模拟和产能预测，验证了该储层部署水平井压裂的可行性和工程甜点预测的可靠性，为海上致密气藏水平井压裂方案优化和大规模效益开发提供了重要技术支撑。

Unconventional tight reservoirs are characterized by strong non-homogeneity, low resource abundance, low porosity and low permeability. Compared with onshore unconventional reservoirs, hydraulic fracturing of offshore tight gas reservoirs has greater safety risks greater and more operational difficulties, leading to greater difficulty in balanced reservoir modification. Therefore, deployment of horizontal wells for hydraulic fracturing development in offshore tight gas reservoirs requires precise evaluation of reservoir geomechanical characteristics, analysis of the fracturability of horizontal well sections, and fracturing of well sections with similar geomechanics, which can support precise, balanced and efficient development of offshore gas reservoirs. Taking a tight gas reservoir in offshore as the research object, in this study, an engineering fracturability analysis method based on brittleness and in-situ stress difference was proposed, and an engineering sweet spot prediction model was established by kernel density estimation method to estimate the probability density function and cumulative probability function of engineering fracturability. Based on the engineering sweet spot prediction, hydraulic fracturing segments were optimized to achieve a differentiated design of segment spacing. Based on the concept of integrated geological and engineering, hydraulic fracturing simulation and production prediction were carried out in this study. The simulation results verified the feasibility of hydraulic fracturing and the reliability of engineering sweet spot prediction in target reservoir, which provides a significant technical support for the optimization of horizontal well fracturing scheme and large-scale beneficial development of offshore tight gas reservoirs.