鄂尔多斯盆地大气区的勘探实践与前瞻

鄂尔多斯盆地天然气资源丰富，中国石油长庆油田公司（以下简称长庆油田）在该盆地内已先后发现了靖边、榆林、子洲、乌审旗、苏里格、神木等6个千亿立方米级大气田，系统总结该大气区的勘探成果和有效做法，兼具指导和借鉴作用。为此，根据长庆油田50多年的天然气勘探实践，梳理了各主要历史阶段所依靠的地质理论和所取得的认识突破，分析总结了历经长期技术攻关所形成的适用性勘探配套技术，以及在拓宽勘探思路、创新管理机制等方面的历史经验和有效做法。理论突破点包括：河流三角洲成藏理论、大型致密气成藏理论和盆地南部沉积物源体系新认识；技术创新点包括：全数字地震技术、气层测井精细评价技术和致密砂岩储层改造技术；拓宽勘探思路包括：大型岩性气藏勘探部署思路和勘探开发一体化战略；管理创新包括：扁平化项目管理和对标管理。

Exploration practices and prospect of Upper Paleozoic giant gas fields in the Ordos Basin

Natural gas resources is abundant in the Ordos Basin, where six gas fields with more than 100 billion cubic meters gas reserves have been successively developed and proved, including Jingbian, Yulin, Zizhou, Wushenqi, Sulige and Shenmu. This study aims to summarize the fruitful results and functional practices achieved in the huge gas province exploration, which will be regarded as guidance and reference for the further exploration and development in this basin. Based on the past five decades' successful exploration practices made by the PetroChina Changqing Oilfield Company, we first comb the presentation of geological theories at different historical stages as well as the breakthrough in the course. Then, we analyze a complete set of adaptive techniques obtained from the long-time technological research and conclude historical experiences and effective measures in terms of broadening exploration ideas, such as the fluvial delta reservoir-forming theory, giant tight gas reservoir-forming theory, the idea of sediment source system in the southern basin, etc., and innovating technical and management mechanism, such as all-digit seismic prediction, fine logging evaluation for gas formations, stimulation of tight sand reservoirs, flat project and benchmarking management, and so on.