涪陵气田江东区块气井产能构造影响因素研究

Study on Influencing Factors of Gas Well Productivity Structure in Jiangdong Block of Fuling Gasfield

为明确构造因素对页岩气井产能的影响机理,从页岩含气性和压裂改造效果两方面入手,结合涪陵气田江东区块60多口水平井的试气情况,对影响江东区块页岩气井产能的主要构造因素开展了攻关和研究。研究表明:①构造是影响单井产能的关键因素,江东区块构造南北具有差异性,构造变形南强北弱;②断层级次和规模的不同对页岩气保存条件影响的程度(范围)不同,进而影响页岩储层的含气性;③构造埋深、构造形态、天然裂缝发育特征是影响江东区块压裂改造效果的主要构造因素。

In order to clarify the influence mechanism of structural factors on the productivity of shale gas wells in this area,this paper studies the main structural factors affecting the productivity of shale gas wells in Jiangdong Block from two aspects of shale gas bearing capacity and fracturing effect and combined with the gas testing conditions of more than 60 horizontal wells in this area.The results are:(1)The structure is the key factor affecting the productivity of a single well.There are differences between the north and south in Jiangdong Block,and the tectonic deformation is strong in the south and weak in the north;(2)The difference of fault levels and sizes makes different degree(range)of the influence on the preservation conditions of shale gas,thus affecting the gas-bearing property of shale reservoirs;(3)The deeply buried structure,structural configuration and natural fractures development are the main structural factors affecting the fracturing effect in this block.