大庆油田水淹层测井技术(中英文)2009-11-09

第一篇：大庆油田水淹层测井技术(中英文)2009-11-09

大庆油田水淹层测井技术简介

一、水淹层测井技术发展的历程及取得的主要成果

大庆油田属于陆相河流—湖泊三角洲沉积，沉积了一套砂泥岩序列。大庆油田自60年代初实行早期注水分层开采，60年代中后期主要开采油层出现水淹。针对油层水淹问题，随即开展水淹层测井研究。至目前，水淹层测井研究持续40余年，共推出应用了四代水淹层测井系列及其配套处理解释软件。尤其于1994年在油田推广应用了以高分辨率声波、高分辨率三侧向、微球聚焦、密度等为主的高分辨率测井系列，以及与之相对应的水淹层解释方法，水淹层测井综合解释符合率达85%以上，较好地满足了油田加密调整井和注聚合物驱三次采油井的生产需要，对油田的高效开发和稳产做出了突出贡献。该项成果获中国石油天然气集团公司科技进步一等奖。同时也使大庆油田水淹层测井技术处于国际领先水平。

形成的水淹层测井处理解释软件，可以在工作站和微机上运行。软件的主要功能包括：数据库管理、绘图、支持工具、应用模块，具有预处理、自动分层取值、砂岩有效厚度自动划分、水淹层资料处理、人机交互解释等功能。可以进行注水水淹、边水及底水推进水淹层解释。同时形成了利用裸眼井和套管井C/O等测井资料进行平面井间剩余油分布评价软件。广泛地应用于油田生产，处理解释30000余口井，地质效果显著。为此大庆油田公司于2003年奖励测井公司人民币100万元。

二、水淹层测井及解释技术

•水淹层测井系列

以高分辨率三侧向电阻率、高分辨率声波、微球形聚焦电阻率测井为特色的高分辨率水淹层测井系列，对0.2米以上的储层可以准确识别，对0.3米以上的储层可以定量解释。可以进行薄差层、厚层细分精细解释。

其它配套测井项目有：2.5米底部梯度电阻率、微电极、井径、补偿声波、补偿密度、自然电位、自然伽马、C/0能谱测井等。

•水淹层解释技术

针对利用测井资料进行剩余油测井研究，从理论上分析了注水开发油田的宏观水淹机理，建立了“双地层水电阻率”水淹层测井解释的新理论模型，采用“多重迭代递归”方法解决了在地层水电阻率不能确切知道情况下的含水饱和度准确求解难题，引入“基本解释单元”的概念，利用在同一解释单元内多种测井资料的变化梯度，利用“状态空间模型”判断各有效储层间水淹状态在空间上变化趋势，实现储层水淹状况的定性判别。应用在国际上首次建立的利用测井资料确定储层润湿性和相对渗透率方法，定量计算储层含水率，从而给出水淹层测井解释定量结论。

三、解决的主要地质问题

针对苏丹1/2/

4、3/7区块和伊朗鲁迈拉区块综合含水已达60%左右，个别井含水已达80%的情况，认为大庆油田的高分辨率水淹层测井技术可以应用于上述区块。应用裸眼井测井资料进行储层细分精

细解释，确定井剖面单层剩余油、层内细分剩余油分布，为选择射孔层位提供依据。同时可以在生产井中进行C/0能谱测井，寻找和确定高含水层位和高剩余油层位，为堵水、补孔方案制定提供依据。

以提高采油量、控制含水上升为目标，可以综合利用裸眼井测井资料和生产井C/0能谱测井资料进行区块多井综合评价，确定平面上的井间剩余油分布状况和特征，为采油方案编制提供依据。

Water Flooded Interval Logging Technology

1.development of Water flooded interval Logging technology

Daqing oilfield features terrestrial river-lake delta deposition with a sand shale sequence reservoir heterogeneity.Daqing oil field operated with early water infection gradation in early 60s ,then in mid-late 60s major mining reservoir was flooded by water.For reservoir flooding problems, water flooded interval logging study was carried out, To the present,water flooded layers logging technology has focussed 40 years of hard work,during this time,the wireline company has developed the forth generation of processing and interpretation software.Oilfield promote a high-resolution logging series which was based on a high-resolution sonic log, high-resolution three lateral log, micro-spherically focused log, density Etc.In 1994 , as well as corresponding to interpretation of the water flooded interval, the thick water flooded interval interpretation coincidence rate exceeds 85%, meet the production needs of oilfield for infilling wells and three injection wells polymer flooding.The achievements have been awarded the first prize of China National Petroleum Corporation scientific and technological progress , water flooded interval Logging technology get the international advanced level in Daqing Oil Field.single well processing and interpretation software of water flooded interval could be run withcomputer and workstation.The software's main function include: database management, graph plotting, support tools, application module, pre-processing, automatic hierarchical value, automatic classification effective thickness of sandstone, watered-out reservoir data processing, user interaction interpretation, etc;and it could improve Water flooded interval interpret through water injection,edge water impelling and bottom water impelling.At the same time the software is finished by using data of open hole&C/O in cased hole to evaluate well-to-well remaining oil distribution.The technology is widely used in oil field production and has evaluated more than 30000 wells that achieved significant results.For this achievement Daqing Oil Field Limited-Liability Company award 1 million RMB to Daqing Well Logging Company in 2003.2.Water flooded interval logging and interpretation

•Logging series for water flooded interval

This system has distinct identification in laminated bed of 0.2m, quantitatively reservoir evaluation and in laminated bed of 0.3m or above with high-resolution logging series such as high-resolution lateral or resistivity, high-resolution sonic, micro-spherically focused log.It resolves of dividing laminated beds and thick beds,and can interpretation,along with other logging project as 2.5 m resistivity, caliper,Compensated Acoustic Logging, compensated density, spontaneous potential, natural gamma, C / O spectral log.•Water flooded interval interpretation technique.This technique analyzes the reason of water flooded for water inject oil field in theory through using logging data to study the remaining oil in the formation.Dqing wireline developed a new well logging interpretation mode for water flooded formations of the development oil field through injected water-dual formation sater resistance model.The Multiple Iteration Recursioni algorithm is calculated to determine water saturation when the formation water resistance can not be defined.By way of bring out concept of “basic interpretation unit”,we can utilize the difference of logging data in the same interpretation unit,utilize state space model to distinguish Variations tendency of the degree of water flooded between recoverable zones,finally,to qualitatively define degree of water flooded.By using the method of utilizing logging data to determine reservoir wettability and relative permeability,we can quantitatively define the degree of water flooding, and give quantitative conclusion of water-flooded logging interpretation.3.Applications in oil field

comprehensive water has reached about 60% in Sudan 1/2/4 blocks and 3 / 7 blocks, as well as in Iraq Rumaila oilfield, some wells reached 80% total output of water, the high-resolution Water flooded interval Logging technology can be applied to the blocks above.openhole logging data can be used for detailed interpretation of reservoir, determine the remaining oil in single-well profile, layer remaining oil distribution segments, thus provide the basis for selection perforation horizons.C / O spectral logging can be carried out in production wells, tracing and identification of high-water content reservoir and high residual oil, fulfill the optimization of water shutoff and casing perforation program.To increase oil output and control the water content , open hole logging data and C / O spectral logging are applied to productionwells,comprehensive evaluation of multi-well block conducted and distribution of remaining oil between wells is determined, open hole logging and C / O spectral logging play a very important role in oil recovery program.