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油气藏的复杂性川中大安寨层各油气藏都很复杂,具体表现在: 1.是裂缝性油气藏; 2.油气性质变化很大,从常规原油到凝析油气均有; 3.压力系统不一致,有常压,也有高压异常,且各地区的压力系数亦有异。现分别讨论如下: 1.裂缝油气藏从油气藏生产动态看,多数油气藏表现出裂缝产出特征,因此,研究裂缝至关重要。裂缝不是没有规律可循的。按成因可分为构造缝与沉积缝两大类。对生产起重要作用的主要是构造缝。四川石油工作者总结的“三占三沿”即为构造的分布规律。但应注
The Complexities of Reservoirs The reservoirs in the Da’anzhai Formation in the Central Sichuan Basin are all very complex. They are as follows: 1. They are fractured reservoirs. 2. Their properties vary greatly from conventional crude oil to condensate hydrocarbons. 3. The pressure system Inconsistent, there are atmospheric pressure, there are high-pressure anomalies, and the pressure coefficient of different regions are also different. The following are discussed separately: 1. Fractured reservoirs Looking at the production dynamics of the reservoirs, most of the reservoirs show the characteristics of the fractures. Therefore, it is of crucial importance to study the fractures. Cracks are not without rules. According to the cause can be divided into structural seams and sedimentary seams into two categories. The main production plays an important role in structural joints. Sichuan oil workers summed up the “three accounted for three along” is the structure of the distribution. But note