浅析膏盐岩发育与油气成藏的关系

“油盐共生”理论由来已久,据统计,全球66个有膏盐分布的含油气盆地拥有世界一半以上的探明储量。究其原因,是由于膏盐岩本身的塑性强、易流动、致密及石膏转化为硬石膏时的大量脱水等特性,使其优于其它岩类而可能同时具备生、储、盖的能力。从油气成藏的角度出发,系统论述了膏盐岩所起的决定性作用,并进一步指出盐间和岩性相变带寻找隐蔽性油气藏,以及膏盐岩对超压的保存于高压天然气成藏的重大地质意义。

Brief discussion on the relation between the development of salt & gypsum rock and hydrocarbon accumulation

Symbiosis of oil and salt theory has been existed for a long time.It is estimated that 66 oil&gas basins develo- ping salt&gypsum rock have more than half proven re- serves in the world.With the characteristics such as strong plasticity,good fluidity,compactness and dehy- dration,the salt&gypsum rock is superior to other kinds of rocks and have the ability of generating,accumulating and sealing.In terms of hydrocarbon accumulation,this article makes a systematic discussion on the decisive role of salt&gypsum rock.It is found that the subtle hydro- carbon reservoirs are developed in salt interbed and lithol- ogy phase transformation zones.Moreover,it also points out the anhydrite layers are significant to geology in high- ly over pressured gas reservoir.