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  

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

作　　者：赵雪凤[1,2] 朱光有[1] 张水昌[1] 刘钦甫[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国矿业大学,北京100083

出　　处：《沉积学报》2009年第3期390-403,共14页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40602016);中国石油天然气股份有限公司科技风险创新研究项目《碳酸盐岩新型溶蚀模式的确立和优质储层的预测方法研究》资助

摘　　要：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。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 the big difference. The reservoir thick of the reef-bank facies reservoir in the northeast of Sichuan Basin is bigger, the porosity and permeability is better than the reservoir of Tazhong, and the lithologic character of the former is dolomite, the latter is limestone. The comparison research of the two areas discovered that the difference is controlled in the following factors： The high energy sedimentary environment and eustatic sea level change have the decisive control on the thickness and poroperm capability of reservoir; the gypsum can affect the dolomite occurrence to a certain extent, improve the poroperm capability of reservoir ; the hydrocarbon charge time, the reservoir burial evolution, as well as hydrocarbon-fluid-rock interaction and so on have obvious control on the formation and preservation of the secondary pore, hole and fracture. Because in the northeast of Sichuan Basin when the reef-bank body is growing, the eustatic sea level change is comparatively steady and the water energy is very high, are advantages to grow thick and clean reef-flat body; dolomite is more, recrystallization is common ; hydrocarbon is early charge , the reservoir fast bury deeply at the front and in uplift at last, these are advantages to grow the second porosity, so the storage quality of reef-bank reservoir in the northeast of Sichnan Basin is better than Tazhong area.

关 键 词：深部优质储层 礁滩体储层 白云岩 流体-岩石相互作用 普光 塔中 

分 类 号：P588.2[天文地球—岩石学] TE122.2[天文地球—地质学]