铜锣峡构造中南段长兴组储层特征及评价

THE RESERVOIR CHARACTERISTICS AND EVALUATION OF CHANGXING FORMATIONIN THE MIDDLE AND SOUTH SECTION OF TONG LUO XIA STRUCTURE

铜锣峡构造中南段长兴组沉积时处于深缓坡至浅缓坡环境 ,长兴组地层上部发育有点礁 ,但未发现礁组合。储层储集空间以次生孔隙为主 ,具有明显的低孔低渗特征 ,局部溶蚀孔、洞及构造裂缝相对较发育 ,非均质性较强 ,储层为碳酸盐岩裂缝型储层。储层质量及发育部位受多因素的控制 ,通过采用地震速度块反演及有限元应力模拟等方法对储层进行综合预测 ,发现储层横向上呈点团状分布 ,具有沿小断层发育的趋势 ,相对而言研究区北部储层更发育。另外 。

The Changxing Formation in the middle and south section of Tong Luo Xia Structure was located from deep ramp to shallow ramp depositional environment. There are reefs in the upper section of the Changxing Formation, but not the reef combination. The reservoir pores are dominated with secondary ones, with apparent low porosity and low permeability. The partly dissolved pores and holes, as well as structure fractures develop well, with strong heterogeneous characteristics. The reservoirs are fractured carbonate rocks. The property of reservoir and the location of the well-developed reservoir are controlled by multi-factors. With the help of seismic velocity inversion and finite element stress modeling, it is found that reservoir distributes laterally with patch pattern, and relatively develops along the small faults. Generally speaking, the reservoir in the north section of studied area develop better. In addition, it is predicted that two areas with potential reservoir exist in the sub-traps of Ming Yue Chang and Tian Kou Chang.