川东北普光地区与塔中地区深部礁滩体优质储层的对比研究

近年来在四川盆地川东北地区和塔里木盆地塔中地区发现了深部礁滩体优质储层，为我国深部海相碳酸盐岩油气勘探带来了希望。虽然这些礁滩体分布范围广，储层性质好，探明油气储量大，但是这两个盆地的礁滩体储层却存在较大的差异:川东北礁滩体储层比塔中礁滩体储层厚度大，孔渗性好，前者岩性为白云岩，而塔中则为灰岩。对比研究认为这些差异性受控于以下因素:高能沉积环境和海平面升降变化过程对储层的发育厚度和孔渗性能具有决定性的控制作用；膏岩一定程度上控制了白云岩化作用的发生，白云化过程改善了储层的孔渗性能；烃类的充注时间、储层的埋藏演化、以及烃类流体与岩石的相互作用等对次生孔、洞、缝的形成与保存具有明显的控制作用。由于川东北礁滩体发育时期海平面升降过程相对稳定，水体能量较高，有利于发育厚层礁滩体；白云岩化程度较高，重结晶现象比较普遍；油气充注较早且储层早期快速深埋，后期又处于抬升状态，利于次生孔隙的形成和保持，因此川东北深部礁滩体的储集性能明显优于塔中奥陶系深部礁滩体储层。

Comparison of Deeply Buried and High-Quality Reef-Bank Facies Reservoirs of Puguang Gas Field in the Northeast of Sichuan Basin with Tazhong Gas Fields of Tarim Basin

In recent years,deeply buried and high quality reef-bank facies reservoirs have been discovered in the Changxing and Feixianguan Formation in the northeast of Sichuan Basin and the Lianglitage Formation of Tazhong area in the Tarim Basin has brought the hope for the oil-gas exploration in deep marine facies carbonate strata.Although this reef beach body distribution range is broad,the reservoir quality is good,the proving oil gas reserves are big,but these two basin's reef beach body reservoir actually has ...