四川盆地碳酸盐岩缝洞系统形成条件及分布预测
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摘要
根据四川盆地二、三叠系碳酸盐岩缝洞系统气藏特征，提出了裂缝圈闭概念及其分类。从缝洞性储层的沉积、成岩、成岩后生变化、构造变形等方面探讨了缝洞系统的形成、演化。在建立不同类型构造的裂缝模式基础上，分析了制约裂缝发育和开启程度的诸因素，阐明了裂缝圈闭形成机理和大裂缝圈闭分布规律，证明了裂缝圈闭气藏存在原生和次生两种成藏模式，为选择与研制相应的勘探技术与方法提供了理论依据。在总结以往预测技术的基础上，研制应用了频率域多项式拟合、子波整形高分辨率处理与解释、地震模式识别、分形分维等多项新技术，为优选、评价裂缝圈闭勘探目标、精选井位、提高钻探成功率提供了有效勘探方法，并将钻探成功率提高了１０％～２０％，取得了显著的经济、社会效益。
In the light of the characteristics of the fracture-cavity system gas reservoirs in Permian and Triassic carbonate rocks in Sichuan Basin,the fracture trap concept andclassification are proposed out. The formation and evolution of fracture-cavity system are discussed in the light of the change in sedimentation,diagenesis,post-diagenesis in fracture-cavity reservoir and the structural deformation etc. Based on setting up the fracture modes ofvarious types of structures,the factors of restricting fracture development and opening degree are analysed;the fomation mechanism of fracture trap and the distributive laws of thelarge fracture trap are expounded;it is proved that fracture trap reservoirs have primary andsecondary reservoir-formed modes and the theoretical basis for selecting and developing appropriate exploration techniques and measures are provided. Based on summing up previouspredication techniques,many new techniques such as frequency domain polynomial fitting,wavelet shaping high-resolution processing and interpretation,seismic mode identification,shaping and dimensioning etc. are developed and applied, and the effective methods for optimizing and evaluating exploration goals of fracture traps,accurately choosing well locationand raising drilling succes ratio (enhanced by 10%-20% ) are provided. Notable economicand social benefits are obtained.
In the light of the characteristics of the fracture-cavity system gas reservoirs in Permian and Triassic carbonate rocks in Sichuan Basin,the fracture trap concept andclassification are proposed out. The formation and evolution of fracture-cavity system are discussed in the light of the change in sedimentation,diagenesis,post-diagenesis in fracture-cavity reservoir and the structural deformation etc. Based on setting up the fracture modes ofvarious types of structures,the factors of restricting fracture development and opening degree are analysed;the fomation mechanism of fracture trap and the distributive laws of thelarge fracture trap are expounded;it is proved that fracture trap reservoirs have primary andsecondary reservoir-formed modes and the theoretical basis for selecting and developing appropriate exploration techniques and measures are provided. Based on summing up previouspredication techniques,many new techniques such as frequency domain polynomial fitting,wavelet shaping high-resolution processing and interpretation,seismic mode identification,shaping and dimensioning etc. are developed and applied, and the effective methods for optimizing and evaluating exploration goals of fracture traps,accurately choosing well locationand raising drilling succes ratio (enhanced by 10%-20% ) are provided. Notable economicand social benefits are obtained.
引文
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