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在南方海相川东断褶带黄金口构造带，由于受多期地质构造运动和沉积条件的影响，地层倾角较大，在毛坝1井直井钻探过程中发现，大部分地质构造表现出了较强的地层自然造斜能力，防斜和打快形成了尖锐的矛盾，该地区的其它直井也面临同样的矛盾，严重制约了该地区的勘探和开发进程，急需寻找经济有效的钻井技术提高机械钻速。对此开展了该地区的地层自然造斜规律研究，利用反演法、统计法和参比法等，结合毛坝1井地层倾角测井解释结果和实钻数据分析，反演出了该地区的地层倾角和走向，最终得到了地层自然造斜规律，其研究结果用于指导毛坝2井的井眼轨道设计和井眼轨迹控制施工，利用地层自然造斜规律设计定向井的方位角和轨道剖面，在实际钻井过程中，充分利用地层自然造斜规律优配钻具组合和优化钻井参数以控制井眼轨迹，已取得了解放钻井参数，减少定向钻进时间，提高钻井速度的良好效果。

APPLICATION OF STRATIGRAPHIC NATURALLY WHIPSTOCKING LAW IN THE DESIGN AND OPERATION OF WELL MAOBA--2

The stratigraphic dip angles in Huangjinkou structure of East Sichuan fault fold belt (South China marine strata) are relatively great because of the effects of multistage tectonic movements and sedimentary conditions. In the process of drilling well Maoba 2， it was found out that the stratigraphic naturally whipstocking capacity is relatively strong and a sharp contradiction between well deviation control and raising penetration rate has been formed. For this reason， a research on stratigrapic naturally whipstocking law was carried out. By use of inversion method， statistical method and comparative method， the stratigraphic dips and strikes in the region were inversed in combination with the results of the stratigraphic dip log interpretation and drilling data analysis of well Maoba 1， thus finding out the stratigraphic naturally whipstocking law. Suck a research result was used for guiding the hole trajectory design and operation control of well Maoba 2. The azimuth angles and trajectory profile of directional hole was designed by applying the stratigraphic naturally whipstocking law and the drill string assembly and drilling parameters were optimized through fully utilizing the law in the process of drilling so as to control the hole trajectory， thus achieving a good effectiveness of opening up drilling parameters， reducing directional drilling time and raising penetration rate. (Financed by the project of Key Technologies Research and Development Program of the “Tenth Five Year Plan”：“Matching Drilling Technology of Complicated Reservoir and Its main Equipment”， No. 2001 BA 605 A-13)