中国深盆气勘探开发前景与对策

PROSPECTS AND COUNTERMEASURES FOR EXPLORING AND DEVELOPING THE DEEP-BASIN GAS IN CHINA

中国不少盆地或地区具备深盆气形成的基本地质条件 ,鄂尔多斯盆地石炭—二叠系勘探已发现大型深盆气气田。 6个盆地 (凹陷 )深盆气的远景资源量初步估算可达 1 0 0× 1 0 1 2 m3。国外研究及勘探经验表明 ,在目前技术条件下可勘探开发的有效资源量只占远景资源量的 1 0 %～ 2 0 %,随着勘探开发技术的提高 ,可利用的有效资源量占远景资源量的比例会不断有所提高。欲有效勘探开发国内深盆气资源 ,需采取的主要对策是 :①深化深盆气成藏地质条件和成藏机制的研究 ;②建立和完善针对薄层致密砂岩气层的横向预测技术 ;③钻探中采用保护气层的欠平衡钻井和防污染措施 ,开发上重点发展分层压裂、多层合采和低成本的开发技术。

The basic geological conditions of forming deep basin gas reservoirs exist in a lot of basins or areas in China, and a large deep basin gas field has been discovered in Carboniferous and Permian strata in Ordos Basin. The perspective resources of deep basin gas in 6 basins(or depressions)are initially estimated about 100×10 12 m 3 According to overseas exploratory practices,exploitable resources only accounts for 10%～20% of perspective resources under the present technological conditions Along with the advances and improvements of exploration and development techniques,that the ratio of exploitable resources amounts to the perspective ones will be increased continuously. In order to effectively explore and develop the deep basin gas reservoirs in China,the main countermeasures adopted necessarily are as follows:① deeply investigating the geological conditions and reservoir forming mechanism of deep basin gas;② establishing and improving the lateral prediction techniques for thin tight sandstone gas reservoirs;③ adopting under balanced drilling and anti pollution techniques to protect gas reservoirs, emphatically developing separate layer fracturing,multi layered production and low cost techniques