川东南盆缘复杂山地区页岩气井场选址研究

Study on the siting of shale gas well sites in the complex mountain region of the southeastern Sichuan Basin

我国南方地区页岩气资源丰富,同时面临地上地下“双复杂”的特点,随着勘探开发工作的不断深入,优选适宜井场的难度不断增大。为探索简单、实用、高效的井场选址技术方法,以提高页岩气勘探开发成功率,且降低安全、环保、工程风险和投资成本,提升经济效益。本文以川东南盆缘复杂山地区南川页岩气工区为例,研究提出了南方复杂山地区页岩气井场选址的思路和技术方法。核心思想是统筹兼顾地下、地上条件,地下综合评价优选地质和工程“双甜点”,地上立足安全、环保、经济、技术四要素,在安全和环保两个刚性评价参数施行“一票否决”的基础上,优选地形坡度、连片面积、形状因子3项关键参数,建立了定量化页岩气井场选址评价标准,采用信息提取、叠加分析等地理信息系统(geographic information system,GIS)技术手段,优选页岩气井场适宜区。研究区实钻井位表明,该方法评价优选结果可靠,具有一定的推广应用价值,可为相似工区油气勘探开发部署工作提供参考借鉴。

South China has a great potential for the shale gas resources with a broad prospect for development,but at the same time,it is faced with the characteristics of“double complexity”of above ground and underground.With the continuous deepening of exploration and development,it is increasingly difficult to select suitable well sites.In order to explore a simple,practical,and efficient well site location technology method,so as to improve the success rate of shale gas drilling,reduce the risks of safety,environmental protection and engineering,and investment costs,and improve economic benefits.Taking the shale gas working area of Nanchuan as an example,The idea and technical method of selection for the shale gas well site in the complex mountain area of southern China are put forward.The core idea is to give overall consideration to underground and above-ground conditions.For the underground comprehensive evaluation,we give priority to the geological and engineering"double sweet spot",For the ground comprehensive evaluation,it is based on the four elements of safety,environmental protection,economy and technology.On the basis of the"one vote veto"of the two rigid evaluation parameters of safety and environmental protection,three key parameters of terrain slope,contiguous area and shape factor are selected,and the evaluation standard for site selection of quantified shale gas well site is established.By using GIS technology such as information extraction and superposition analysis,the suitable area of the shale gas well field is optimized.The actual drilling position in the study area shows that the evaluation results of this method are reliable and have certain application values,which can provide a reference for the deployment of oil and gas exploration and development in similar work areas.