A DISCUSSION ON THE GENETIC MODEL OF CRACK SYSTEM IN THE PERMIAN CARBONATE ROCKS OF SICHUAN PROVINCE
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摘要: 本文提出了四川盆地二叠系碳酸盐岩储层裂缝系统的成因模式,即在致富的碳酸盐岩条件下,首先由构造作用发育构造裂缝,构造裂缝被溶蚀、扩大,各种次生孔、同、缝大量形成,并充分勾通起来,形成具有储渗流体能力的裂缝系统.在长期的构造运动和成岩作用反复改造下,裂缝系统不断形成并可能被充填.目前有效的裂缝系统是多旋回构造运动和成岩作用反复进行的最后结果,其分布既有规律性,也存在着非均质性或随机性.Abstract: The authors proposed a genetic model of crack system of the Permian carbonate reservoirs of the Sichuan basin. The model shows that structural fractures were developed inthe dense carbonate rocks due to tectonic activity, then the fractures were dissolved and enlarged,and various secondary pores,cavities and cracks were formed and connected with each other, generating a crack system with the function of reservoir and permeability for fluid flow. The crack system can continuously be reformed and may be filled during the long tectonic activity and diagenesis. The present valid crack systems are the final result of multicycle tectonic movements and diagenesis. Their distribution is regular and anisotropicor probabilistic.
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[1] 曾允孚、夏文杰主编.沉积岩石学.北京:地质出版社.1985 [2] 樊生利、童崇光.四川大足-隆昌二盈系碳酸盐储层裂缝系统的研究.成都地质学院学报,1991,18(4) [3] 陈显群等.东吴运动质疑及川黔运动之所见.石油与天然气地质,1987.8(4) -
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