水淹层测井资料单井处理解释软件，采用 SUN 工作站作为硬件平台和 UNIX操作系统作为软件平台进行开发，用 C++和 Fortran 语言编程，以 X-Window 和 Motif 作为图形窗口系统和界面工具。完成了界面管理、数据管理、深度校正、厚度解释、分层取值、水淹层处理、交互处理解释以及成果图绘制等功能。充分的人机交互功能、友好的用户界面，可使测井分析家在调整井测井资料解释中无可替代的作用得到最大程度的发挥。
Daqing Oilfield is flvial-lake delta deposit. Thue heterogeneity of the reservoir is serious. Thin and bad reservoir develops commonly. After the oilfield entered the development period with high water-bearing, the type of remaining oil distribution is various and in high dispersion state. Meanwhile, the waterflood path is formed in the reservoir because of washout with long period of water injection and main thick oil layers are all in high water-bearing. The producing reservoir have shifted the third production from the main thick layers to thin, bad ones and on the top of thick layers gradually. It becomes important tasks and one of topics to research on heterogeneity of the inter layers and inner, interpreting on thick layers subdivision, identifying non-watered-out layers and low watered-out layers correctly with log data for middle/thick reservoirs, and to enhance the capability of identifying and interpreting the thin/bad layers by high-resolution technology, to identify different zones with high/low water-bearing, to improve the interpretation precision of remaining oil saturation, to seek the relative abundance zone of remaining oil for thin/bad reservoirs, to provide correct evidence for the production and potentialities of the oilfield.
In 1990s, we researched out the method for subdividing thick reservoirs and the interpretation method for thick and thin/bad reservoirs. The method for subdividing thick reservoirs is to establish the interpretation model on the basis of well logging data and core analysis data. This method can describe the watered-out degree and remaining oil saturation at different areas in thick layers precisely. By using the method of first qualitative analysis and then quantitative analysis, the model gives four watered-out degrees quantitatively and provides a set of reservoir parameters with high precision. For the thin watered-out zones, since the extension area is limited, the phase change frequently, the lithological properties vary, the statistical analysis method cannot be used properly. Therefore, a new model, double formation water resistivity model, has been proposed. Through this model water saturation can be described by the method of multi-iteration and recursion. The criterion for identifying watered-out degree of different lithological reservoirs can be unified by free water saturation. This method can be used in wide range of formations and not easily affected by conditions, such layers and areas.
For the log data processing and interpretation software, the introduced interpretation system for exploration wells has been the major interpretation software. It cannot process and interpret the data for the watered-out zones. Software is media of method. The processing and interpretation method is required urgently to turn into present productivity. New software needs urgently to combine with the mature data processing and interpretation method. Therefore, developing a processing and interpretation system on well logging data becomes crucial to meet the requirements of oilfield production.
The processing and interpretation software system on log data for single well in watered-out layers is developed on SUN work station as a hard base and UNIX operation system as a soft base, programmed by the language of C and Fortran, X-window and Motif as graphical windows system and interface. It can play roles on depth adjustment, thickness interpretation, processing by individual layers, watered-out zone processing, interactive processing and interpretation, etc.. This software system has powerful interactive functions and friendly user’s interface, enabling the well logging analyst to give full play to their professional knowledge.
After the completion of this project, more than 30 copies of this software have been installed and functioned in oil production companies from No.1 to No.7. The application on production wells has showed apparent geological effectiveness. Oil production companies have enhanced the technical level of well logging interpretation by transforming from manual method to computer processing. On-site production statistics shows that, reservoir thickness interpretation precision can be over 90% by processing automatically. For the watered-out layer interpretation, the conformity can meet the production requirements through interactive processing. The results can be input into geologic database conveniently.
The software application demonstrates that this method can shorten the data processing period. The thickness interpretation, watered-out layer interpretation and drawing drafting can be conducted on the computer almost simultaneously. It can reduce the labor intensity, also shorten the period for processing and turning over log data and improve the work productivity.