摘要
元坝气田长兴组气藏是国内目前发现的埋藏最深、高含硫化氢和二氧化碳、礁滩相气藏，储集层为中低孔、中低渗碳酸盐岩。目前国内外关于类似气藏井网井距研究的相关报道较少，因此，确定元坝气田长兴组气藏井网合理井距对于保证气田开发取得最佳开发效果和经济效益具有重要意义。文中从地质、气藏工程、数值模拟和经济效益分析等角度探讨了气田井网井距，分别按照经济极限控制储量法、渗透率与泄气半径关系法、定单井产量法、经济效益最大化法计算了经济极限井距和技术合理井距。综合考虑气藏地质特征、经济效益和井型，采用多种方法研究确定元坝气田长兴组气藏的经济合理井距为：直井1 800～2 000 m，大斜度井2 000～2 400 m，水平井2 400～3 000 m。
Abstract
Changxing Formation in Yuanba Gas Field is a reef flat gas reservoir with high content of hydrogen sulfide and carbon dioxide, which is the most deeply buried reservoir at present in China. It is also a medium-low porosity and permeability carbonate reservoir. Currently, the reports on the well pattern and well spacing that is resemblance to this gas reservoir are rare at home and abroad. Thus, in order to achieve the best development effect and economic benefits, it is significant to define a reasonable well pattern and well spacing of Changxing Formation in Yuanba Gas Field. Integrated with the geology, reservoir engineering, numerical simulation and economic evaluation, this paper discusses the determination methods of well pattern and well spacing with different methods, such as the economic limit controlling method of reserves, the relationship method of permeability and gas drainage radius, constant production rate method and maximum economic benefit method. Considering the geological characteristics of gas reservoir, the economic benefit and well types, the economic and reasonable well spacing of Changxing Formation in Yuanba Gas Field was determined as follows: 1,800-2,000 m for vertical wells, 2,000-2,400 m for slant wells with high angle, 2,400-3,000 m for horizontal wells.
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