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新都气田遂宁组气藏开发前期评价
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摘要
新都气田遂宁组气藏探明储量一百亿方,并以储层致密、储量丰度低、含气性复杂、单井产量低且差异大、非均质性强为突出特征。由于气藏地质的认识程度较为滞后,气藏的储层及储量落实程度不高,在现有的经济条件和开采工艺技术条件下可动用储量的分布范围不清,气藏的产能特征及其影响因素也不落实,影响了气藏的开发部署及开发决策。针对气藏开发面监的问题,在深化气藏地质认识的基础上,开展储层、储量及产能评价,论证气藏开发的可行性,并进行以开发层系、井网部署等为重点的气藏工程初步论证,提出气藏的开发部署方案,为气藏开发方案的编制奠定基础。
     研究中,利用气藏现有资料及评价技术,进一步落实了气藏的构造形态和储层微相类型,新都遂宁组气藏为一个北倾南仰的鼻状构造,储层主要为三角洲平原亚相及前缘亚相的分流河道砂体,主要呈北西~南东向的条带状展布;遂宁组气藏有JSN11和JSN12两套主要工业气层;在储层评价中,编制了储层砂体厚度、有效厚度、孔隙度、渗透率、含气饱和度、电阻率、储能系数、产能系数等参数平面图,结合地震、钻井、试气及试采资料,预测出气藏开发有利区;在储量评价中,重新计算气藏地质储量,并建立了储量分类评价标准,分析了储量的品质及其可动用性,落实了近期可动用储量的大小及分布,评价出目前技术经济条件下的可开发储量为24.47亿方;在产能评价中,从气井测试成果着手,分析了气藏产能分布特征,并采用多种方法预测了气井的合理产能,单井初期合理产能在0.8—2.0×104m3/d左右;在上述研究基础上,提出了气藏局部范围内实施开发的可行性。
     针对气藏致密低渗、低丰度、低压、低产和非均质性强烈的特点,采用气藏工程方法,引入数值模拟成果及经济评价论证了适合遂宁组气藏的开发层系、井位井距、采气速度等开发技术对策,最终提出了气藏的开发部署方案:新都遂宁组气藏的两套气层可作为一个开发层系,采用衰竭式的开发方式和非均质布井方式,开发井距控制在600—800m,平均单井配产1.1×104m3/d左右,采气速度控制在2%—3%左右,预计可新增开发钻井6—12口,整个遂宁组气藏可形成0.8×108m3/a左右的天然气生产能力。为遂宁组气藏乃至整个新都气田的产能建设和产量增长奠定了基础。
     论文最后,针对新都遂宁组气藏勘探开发中现存的问题提出了三点建议:第一,进一步加强新都遂宁组薄层砂岩及其含气性的地震预测研究,以提高钻井成功率;第二,建议改进钻井工艺,试验空气钻井对保护储层、提高单井产能的效果;第三,优选开发试验区,对新都遂宁组气藏的井网、井距、采气速度、稳产年限以及钻采和压裂工艺等内容进行试验研究及系统论证,为气藏开发方案的编制奠定基础。
There are 100×l0~8m~3 of proved GIP in Suining formation gas reservoir of Xindu gas field. The reservoir has the characteristics of tight reservoir, low abundance, discontinuous hydrocarbon content distribution, low productivity and quite different between wells, strong heterogeneity. Because of the defects on the understanding level for the gas reservoir geology and the low certainty of the reservoir and reserves, the distribution of producable reserves on the basis of economic evaluation and production technologies at present and the reservoir productivity with its influential factors are not well understood, which have effects on making the development deployment and the development decisions. Aiming at the problems the reservoir have to face with, the research on reservoir evaluation, reserves evaluation and productivity evaluation are carried out based on the deepen understanding of gas reservoir geology. Furthermore, reservoir exploitability, storey of gas exploitation and well pattern development are also focused on in this paper for gas reservoir engineering research of the early stage, which establish excellent foundation for making the development project.
     In this research, based on the information and data of this reservoir and evaluation techniques, and further carried out the structure appearance and the types of micro-reservoirs ,Suining formation gas reservoir of Xindu gas field.Xindu Suining Group is a gas reservoir north of the dumping South Yang-nose structure, the main reservoir for the Triangle Chau and plain-front subfacies of the distributary channel sand body, mainly in the North West to the South East to the distribution of the band; Suining Gas possession of JSN_1~1 and JSN_1~2 two major industrial gas in reservoir evaluation, preparation of the reservoir sand thickness, effective thickness, porosity, permeability, gas saturation, resistivity, storage coefficient, parameters such as production capacity coefficient floor plan, the combination of seismic, drilling, filling and test mining test data, prediction Outgassing favorable reservoir development zone in reserves evaluation, the recalculation of the gas reservoir geological reserves, and established a reserve classification evaluation criteria, the quality of its reserves available, the recent implementation of the size of available reserves and distribution, evaluation of the current under the technical and economic conditions can be developed reserves of 2.447 billion, in the evaluation of production capacity, gas well test results from the start of production of gas reservoir characteristics, and employ a variety of methods to predict the reasonable productivity gas wells, the initial single well reasonable productivity in the 0.8-2.0×10~4m~3 / d around on the basis of the above study proposed local gas reservoir development within the framework of the implementation of the feasibility.
     According to the characteristics of tight reservoir with low permeability, low abundance, low formation pressure, low productivity and strong heterogeneity, research of gas reservoir engineering, especially the numeric simulation and economic evaluation, is carried out to demonstrate the reasonable storey of gas exploitation, well pattern and production rate etc. technical countermeasure for the Suining formation gas reservoir and to propose the development deployment scheme for this reservoir:Xindu Suining group of two gas reservoirs can be used as a gas reservoir development of the system, using failure modes and the development of non-uniform cloth Well, the development of well spacing control in 600-800 m, with the average single well production 1.1×10~4m~3 /d about speed control gas production in 2 percent to 3 percent, is expected to be additional development drilling 6-12 mouth, the whole Suining Group gas reservoir can be formed 0.8×10~8m~3 /a natural gas production capacity around. Suining group for the gas reservoir and the whole Xindu gas field production capacity-building and laid the foundation for growth.
     Papers Finally, Xindu Suining gas reservoirs in the exploration and development of the existing problems put forward three proposals: First, to further strengthen Xindu Suining group Thin layer sandstone and gas-bearing sandstone of the earthquake prediction research to improve the success rate of drilling; Second, the proposed improved drilling technology, test drilling to protect air reservoir, Well Productivity results; third, optimized development zone, the gas reservoir Xindu Suining group net wells, well spacing, gas production speed, stable life, as well as drilling and fracturing technology content, such as research and test verification systems for the gas reservoir development programs lay the foundation for the establishment.
引文
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