摘要
地层水矿化度不仅与地理坐标有关,而且与深度也有密切的关系。油田在勘探开发过程中积累了大量的矿化度资料。过去,对这些资料的分析,多限于一维的或平面的,往往不能充分揭示矿化度的变化规律。本文利用三维分析的新技术,即用三维方法分析三维的资料。通过中原油田文留地区矿化度数据的分析,对该区油气的保存条件有了进一步的认识。有的区域保存条件较好,有的区域由于地表水的淡化作用一直深入到几千米深,封隔条件差,对油气田的存在不利。
Salinity data are common in the processes of hydrocarbon exploration and development, and generally, the data points are distributed irregularly within three-dimensional sedimentary rock bodies. The geologic information inhered was not able to be fully extracted because the methods usually used are confined to one or two dimensions. It is necessary to analyse three dimensionally distributed data by three dimensional methods and to display the results in three dimensions, in which three dimensional mapping is crucial. The technique established by Zhang Juming and Zhang Qirui (1988) can fully meet the requirements of the study. It is a computerizd technique, which can plot block contour map automatically.Salinity data from Wenliu area of Zhong Yuan Oil Field was collected and analysed by traditional methods as well as the new technique. It is not surprising that the information extracted by the 3-D method is much more satisfactory and inspiring than the usual ones. Therefore, it can be concluded that block contour mapping incorporated with 3-D trend surface analysis method is helpful in analysing salinity data from oil field.The conclusion achieved from the analysis of data from Wenliu area are as follows: (1) The salinity variation is mainly controlled by evaporites and the increasing tendency of salinity with depth does not exist, (2) In the southwest of the studied block, there is an impermeable horizon at about 3200 m and serves as seal for .deeper hydrocarbon trapping. (3) In the middle of southeast marginal area of the block, the dilution effect of meteoric water is serious and extended down to several thousand meters, therefore not beneficial for preservation of hydrocarbon.
出处
《地质科学》
CAS
CSCD
北大核心
1990年第1期62-69,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
油田
矿化度
数据分析
勘探
salinity data analysis, 3-D mapping technique, sealing conditions of oil and gas, Wenliu area of Zhong Yuan Oil Field, block contour map
