酸压产能与潜山储层地质特征关系研究

A STUDY ON THE RELATIONSHIP BETWEEN ACID-FRACTURING DELIVERABILITY AND GEOLOGIC CHARATERISTICS OF BURIED HILL RESERVOIRS

以塔里木轮南地区潜山油藏为例,综合分析了碳酸盐岩储层岩性、物性、构造、溶蚀等地质特征与酸压产能之间的关系。研究表明:(1)岩石类型是控制油气产能的基本因素,岩溶类型及发育程度为主要因素。一间房组及鹰山组发育各类砂屑颗粒石灰岩,其原生孔隙发育,有利于岩溶作用发生,酸压效果好的储层均位于该层位内。(2)储层类型及裂缝发育程度是控制油气产能的关键因素,储层类型对酸压效果产能影响大小依次为洞穴型、裂缝-孔洞型、裂缝型。(3)古潜山不同岩性层位展布和不同岩溶地貌单元直接影响高产油气层段的纵向分布。高产井段距古潜山顶面的深度范围变化比较大,不同地区的分布深度不同,但主要分布在200m范围内,尤其是100m范围内;古潜山纵向深度对储层质量的控制仍受控于岩石类型和岩溶相带的分布。

Taking buried hill reservoirs in Lunnan,Tarim area as an example,the relationship between such geologic characteristics as lithology,physical property,structure,dissolution of carbonate buried hill reservoirs and acid fracturing deliverability are comprehensively analyzed.The research indicates that firstly,the rock types are the fundamental factors to control oil and gas production,karst types and their development degree are the main factors.Yijianfang Formation and Yishan Formation which are mainly shoal sedimentation,various limestone deveolps,and primary pores which are in favor of karstification develop,so the reservoirs with good acid fracturing response are in these formation,secondly,reservoir types and fracture development degrees are the key to control oil and gas production.The influence of reservoir types on acid fracturing deliverability are cavity,fracture-pore and fracture orderly,thirdly,different lithostratigraphic distribution and geomorphic karst unit directly influence longitudinal distribution of high production formations.A lot field experiment of acid fracturing indicates that high production wells locate in buried hill peak and depth range changes a lot,the distribution depth is different in different areas,but mostly in 200m,especially in 100m.The dominance of buried hill vertical depth on reservoir quality is still under the control of rock types and longitudinal distribution of karst phase belt.