地層傾斜電測資料之處理套裝程式的開發

A STUDY OF DIPMETER DATA PROCESSING PACKAGE

顧駿偉(J. W. Ku) ； 葉鈺浩(Y. H. Yeh)

《鑛冶：中國鑛冶工程學會會刊》 30卷1期 (1986/03) Pp. 127-144

https://doi.org/10.30069/MM.198603_30(1).0011

摘要

地層傾斜電測，在地質構造解釋上，可提供許多有用的資料。本文首先説明地斜電測資料處理之數學依據，利用地層傾斜儀所記錄的四組微比電阻資料，先作對比運算，配合地層面應具備之平面性與封閉性，決定地層的視傾角與視方位角。再運用方位計所記錄的方位資料，進行井偏修正與方位調整，以得到地層面對於地面之真傾角與真方位角。依循上述計算原理，就中油公司現有電腦設備，經仔細研究後，規劃一模組化地斜電測資料處理套裝程式。在半年餘的設計與測試中，克服了無數的困難，終於在民國七十四年一月初，開發完成該套程式。目前具備的功能包括有：讀取野外或编輯磁帶、電纜移動速度修正、地斜計算、結果圖示及構造傾角移除等項。在地質構造解釋應用方面，本文提出五個實例，分別就中油公司在臺灣海域與陸上鑽鑿探井中測取之地斜電測資料進行解析處理之結果，取出來加以説明比較，實例一為斷層面的解釋，實例二説明不整合面上下地層傾角的變化，實例三為一高傾角地層情形；以上三個例子的處理结果均與施蘭卜吉專業電測公司的结果作比較。實例四説明平滑化對傾角與方位角計算結果之影響，實例五説明構造傾角移除所產生之效果。

並列摘要

Dipmeter log data usually provide much useful information for geological structure interpretation. In this paper, the mathematics foundations for dipmeter data processing are described first. Based on the characteristics of good planarity and good closure in bedding, the apparent dip and apparent azimuth of bedding plane are determined by using correlation operation among the four microresistivity traces recorded by the high resolution dipmeter tool. After the process of hole deviation correction and bedding direction adjustment, the true dip and true azimuth of bedding plane are obtained by using the azimuth data recorded by the inclinometer. According to the principles stated in previous paragraph, a modulized package was designed to process dipmeter log data in VAX-11/780 computer system at Chinese Petroleum Corporation. The package have been successfully developed through much effort in programming and testing for half a year. The functions of the package so far include: field or edited tape reading, dip computation, sound-velocity correction, result plot, and structural dip removal, etc. The results which have been processed by our package are described and illustrated with 5 examples. In each example, the well log data were collected through the survey in Taiwan offshore or land recently. The interpretation of the fault is shown in example 1. The dip variation of bedding planes around unconformity is illustrated in example 2. The processed results of high angle rock layers are described in example 3. All results of the above three examples are compared with those of Schlumberger's method. The influence of smoothing on dip and azimuth is explained in example 4. The effects of structural dip removal are shown in example 5.