川东北海相天然气储集层录井综合评价技术

川东北海相天然气藏储集层是重要的勘探开发目标,由于钻井地质条件复杂,为确保录井的准确识别与评价,引入X射线荧光元素录井、核磁共振录井等新技术,结合综合录井参数开展岩性、物性以及可钻性评价形成录井综合评价技术。通过建立川东北海相天然气储集层X射线荧光元素录井岩性识别响应特征、核磁共振录井和校正的可钻性指数(B)的划分标准,利用与产能密切相关的地质指标(岩性、物性、含气性),建立综合评价系数和综合评价标准,有效解决了川东北海相超深井岩性识别与归位、油气评价等录井难题,为超深水平井长穿有效海相储集层提供了技术保障。实践证明,录井综合评价技术的推广应用,有力地支持了该地区天然气藏的勘探开发工作,较好地解决了该地区录井面临的技术难题,为复杂钻井地质条件下的录井工作提供了新的思路和方法。

Comprehensive mud logging evaluation techniques for marine natural gas reservoirs in Northeast Sichuan

The marine natural gas reservoirs in Northeast Sichuan are an important development and exploration goal.Because the drilling geological conditions are complex,in order to ensure accurate identification and evaluation of mud logging,by introducing X-ray fluorescence element logging and NMR logging and other new technniques,combining with comprehensive mud logging parameters,lithology,physical properties and drilling ability evaluation were carried out and mud logging comprehensive evaluation techniques were formed.By establishing the classification criteria of lithology identification response characteristics of X-ray fluorescence element logging,NMR logging and the corrected drillability index（B）for marine natural gas reservoirs in Northeast Sichuan and using geological indicators（lithology,physical properties,gas-bearing properties）which are closely related to the productivity,the comprehensive evaluation coefficient and comprehensive evaluation criteria were established,which effectively solved mud logging problems of lithology identification and true depth determination,oil and gas evaluation for marine ultra-deep wells in Northeast Sichuan and provided the technical support for ultra-deep horizontal well long penetrating through marine reservoirs.Practice has proved that deployment of comprehensive mud logging evaluation technologies can effectively support the region′s natural gas reservoir exploration and development,solve the technical problems faced to the region′s mud logging and provide new methods for mud logging under the complicated geological conditions.