西莎气田碳酸盐岩气藏储层评价及刻画

Reservoir evaluation and characterization of carbonate gas reservoirs in Xisha gas field

阿姆河盆地西莎气田碳酸盐岩气藏目的层(上侏罗统卡洛夫-牛津阶)岩性多样,储集空间类型复杂,孔、缝发育,研究区岩性识别、储层物性解释困难。本次研究,基于岩心和测井资料,准确识别出了碳酸盐岩储层岩性;建立了研究区储层物性解释模型,评价了碳酸盐岩气藏储层特征;利用裂缝指示曲线,确定了有效裂缝发育段;采用波形指示波阻抗反演技术,预测了有利储层发育范围。研究得出:研究区分为4大类12种岩性类型,明确了裂缝对储层的影响大;预测出储层整体较为发育,确定研究区内存在一个由东南向西北延伸的致密岩性带,对气水的分布起一定封隔阻挡作用。研究成果对同类型气田的开发具有积极的指导作用。

Carbonate gas reservoirs in the Xisha gas field in the Amu Darya Basin have diverse lithology,complex storage spaces,and well-developed pores and fractures,making it difficult to identify lithology and interpret physical properties of the reservoir.This study identified carbonate reservoir lithology based on core and logging data,established a carbonate rock physical property interpretation model,and evaluated carbonate gas reservoirs;the fracture indication curves were used to determine the effective fracture development section;the waveform indication wave impedance inversion technology was used to predict the favorable reservoir development range.This study summarized 12 types of lithology in 4 major categories,and the fractures have more influence on the reservoir.It is predicted that the whole reservoir is more developed.It is confirmed that there is a tight lithologic zone extending from southeast to northwest in the area,which plays a certain role in blocking the distribution of gas and water.The research results have a positive guiding effect for the development of the samilar gas fields.