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综合地震、钻井、测井、生产动态等资料,针对四川盆地安岳气田磨溪区块下寒武统龙王庙组储集层特征与展布、气水分布等影响开发效果的关键地质问题开展研究,确定开发技术对策。结果表明:(1)磨溪区块垂向发育4期颗粒滩体,平面呈现“两滩一沟”格局;(2)储集层可分为溶蚀孔洞、溶蚀孔隙和基质孔隙3种类型,有效储集层以溶蚀孔洞和溶蚀孔隙型为主;(3)储集层基质物性较差,受高角度构造缝影响,整体表现为低孔、中—高渗特征;(4)气藏由西向东,气水界面逐渐降低,呈“三段式”结构,建产区统一气水界面为-4 385 m。在气藏地质特征认识基础上,结合数值模拟结果与国内外相似气田开发经验,确定开发技术政策:以颗粒滩主体发育区作为优先建产目标区;在构造高部位集中布井,延缓边水非均匀推进速度,延长气田稳产期;部署水平井,提高单井产能;确定气井合理配产和调峰气井产量,提升气藏开发效果。
According to the data of the earthquakes, drilling, well logging and production, the key geological problems affecting the development effect of the reservoir characteristics and distribution of the Lower Cambrian Longwangmiao Formation in Moxi block, Anyue Gas Field, Sichuan Basin, are carried out Research, determine the development of technical measures. The results show that: (1) The granulite body is vertically developed in Moxi block, and the plane shows a pattern of “two trenches and one ditch”; (2) The reservoirs can be divided into three types: dissolved pores, dissolved pores and matrix pores Type and effective reservoirs are dominated by dissolved pores and dissolved pores. (3) The reservoir matrix has poor physical properties and is characterized by low porosity and medium-high permeability by high-angle structural seams. (4) From west to east, the gas-water interface gradually decreases, forming a “three-stage” structure. The unified gas-water interface in the construction area is -4 385 m. Based on the understanding of geological characteristics of gas reservoirs, combining with the numerical simulation results and the experiences of similar gas field development both at home and abroad, the development and technical policies are determined: the main development zone of particle banks is taken as the priority target area for production and construction; Non-uniform propulsion speed, and prolong the stable production period of gas field; deploy horizontal wells to improve single-well productivity; determine gas production ration and petroliferous gas well production to enhance gas reservoir development effect.