卧龙河气田石炭系黄龙组储层分布特征研究

Study on Distribution Characteristics of Carboniferous Huanglong Formation Reservoirs in Wolonghe Gas Field

摘要: 石炭系黄龙组作为川东地区卧龙河气田最重要的产层之一，进行石炭系储层分布特征的研究对卧龙河气田的进一步勘探具有重要的指导意义。首先，通过卧龙河气田石炭系储层剖面对比分析可知：I类储层发育少且分布范围窄，II、III类储层纵向发育厚度较大；其次，绘制的储层孔隙度及渗透率的等值线图分析表明，卧龙河气田石炭系黄龙组储层孔隙度主要介于4.5%~6.5%，渗透率主要在0.05~1.0 × 10⁻³ μm²之间变化，以低孔低渗为主，且储层孔隙度和渗透率均由构造轴部、陡带、高部位向边翼部逐渐减小；最后，研究和分析卧龙河气田石炭系不同级别储层等厚图得，II类和III类储层为主要储层类型且横向上连续性好，储层总厚度主要在4~16 m之间变化，靠近构造轴部和陡带部位的储层厚度在10 m以上，而离背斜轴部较远的各井储层厚度低于8 m。

Abstract: The Carboniferous Huanglong Formation is one of the most important pay zones in the Wolonghe Gas Field, eastern Sichuan Basin. The study on the distribution characteristics of Carboniferous reservoir plays an important guiding role in the further exploration of the Wolonghe Gas Field. First of all, through the comparative analysis of the Carboniferous reservoir profiles in the Wolonghe Gas Field, it shows that the type I reservoirs have less development and narrow distribution, and the thickness of the type II and III reservoirs is larger. Secondly, the porosity and permeability of the reservoir contour map shows that the porosity of the Carboniferous Huanglong Formation in Wolonghe Gas Field is mainly between 4.5% and 6.5%, with the permeability varying mainly from 0.05 × 10⁻³ μm² to 1.0 × 10⁻³ μm², with low porosity and low permeability, and the porosity and permeability of the reservoirs decrease gradually from the structural axis, steep zone and high position to the edge part. Finally, the contour maps of different levels of Carboniferous reservoirs in Wolonghe Gas Field are studied and analyzed. The reservoirs of type II and type III are the main types of reservoirs and their horizontal continuity is good. The total thickness of the reservoirs varies mainly from 4 m to 16 m. The thickness of the reservoir near the structural axis and steep zone is above 10 m, while the thickness of each well farther away from the anticline axis is less than 8 m.