摘要
中国非常规天然气储量丰富,主要分布在东海盆地、沁水盆地、鄂尔多斯盆地、四川盆地等区块,其中页岩气储量在非常规天然气资源中占有极大比例,但目前页岩气的勘探开发具有地质沉积复杂、地层岩性特征不明显、储层物性较差等难点,难以实现工业化开采。文章通过岩心观察手段,解释鄂尔多斯盆地主要目的层上古生界沉积环境经历太原组海相潮坪-障壁-潟湖沉积到山西组海陆过渡相三角洲沉积的发展演变,分析该区块页岩气藏在埋深、厚度、有机质含量、热演化程度、含气量等方面具有良好的地质条件及勘探开发前景,建立海陆过渡相页岩气“五步四关键三原则”的勘探评价流程,为更好指导海陆过渡相页岩气勘探潜力评价打下坚实基础。
China is rich in unconventional natural gas reserves,which is mainly distributed in the East China Sea basin,Qinshui Basin,Ordos Basin,Sichuan Basin and other blocks,in which shale gas reserves account for a large proportion of unconventional natural gas resources.At present,however,the exploration and development of shale gas has many difficulties,such as complex geological deposition,unclear formation lithology characteristics,poor reservoir physical properties and so on,so that it is difficult to realize industrial mining.By means of core observation,this paper explains that the sedimentary environment of the upper Paleozoic of the main target layer in Ordos Basin has experienced the development and evolution from the marine tidal flat barrier lagoon deposition of Taiyuan formation to the marine continental transitional delta deposition of Shanxi formation.It is analyzed that the shale gas reservoir in this block has good geological conditions and exploration and development prospects in terms of burial depth,thickness,organic matter content,thermal evolution degree,gas content and so on.The exploration evaluation process of"five steps,four keys and three principles"of sea-land transitional shale gas is established,which lays a solid foundation for better guiding the evaluation of sea-land transitional shale gas exploration potential.
出处
《科技创新与应用》
2022年第18期126-129,共4页
Technology Innovation and Application
