徐深气田火山岩气藏产能特点及影响因素分析

火山岩储层作为大庆徐深气田的有效储层，分布广泛，储量丰富，具有重要的开采价值。由于受火山喷发多期性的控制，其岩性岩相变化较快、岩层致密，孔隙度、渗透率极低，非均质性严重。大多数气井自然产能较低，达不到工业产能。部分井经过大型压裂改造后可获得高产，但是单井产气能力差别较大。火山岩气藏产能具有分布不均衡、生产压差大、稳产条件差、压裂效果明显等特点，而火山岩作为特殊的天然气储层类型，没有成型的开发理论和实际开发经验供我们参考，文章在徐深气田火山岩储层地质及动态资料分析的基础上，采用实际地质参数建立了单井模型，研究了地层有效渗透率、地层厚度、地层系数、压裂井裂缝半长、储层供气范围等对气井初期产能及稳产能力的影响，并对影响产能及稳产能力的因素进行了分析，这对今后火山岩气藏开发配产、产能建设等具有重要的指导意义。

PRODUCTIVITY CHARACTERISTICS AND INFLUENTIAL FACTORS ANALYSIS OF LAVA GAS RESERVOIR OF XUSHEN GAS FIELD

Lava reservoir, as the productive reservoir of Daqing Xushen Gas Field, is widely located and rich in reserves with high production value. Due to repeated eruption of volcanoes, lava reservoirs are characterized by complicated lithological and lighofacies variation, tight rock, extremely low porosity and permeability and severe heterogeneity. The majority of gas wells are of productivity too low to be commercially produced. Some of the wells may show high yield subject to large scale fracturing with considerable production variation among different single wells. Lava gas reservoirs production demonstrates characteristics such as uneven distribution, big production pressure difference, being hard to maintain stable production and apparent fracturing results. As lava reservoir is a typical type of gas reservoirs, no ready development theory and actual production experiences exist for our reference at present. This paper establishes the single well model with real geological data on the basis of analysis of Xushen Gas Field Lava reservoir geological and dynamic data for the purpose of studying the impact of formation effective permeability, thickness, co-efficient, fracture radius of fractured well and formation gas supply scope on initial productivity and stability of gas well production. It also analyzes the factors affecting productivity and stability of well production, which serve as valuable references for lava gas reservoir development and productivity construction planning.