石油与天然气地质 ›› 1983, Vol. 4 ›› Issue (2): 209-221.doi: 10.11743/ogg19830209

• 论文 • 上一篇    下一篇

构造趋势面分析在川中及遂南地区的应用

陈立平1, 朱树良1, 陈立官2, 程光瑛2   

  1. 1. 四川石油管理局川中矿区;
    2. 成都地质学院
  • 收稿日期:1981-11-21 出版日期:1983-06-25 发布日期:2012-01-16

APPLICATION OF STRUCTURAL TREND-SURFACE ANALYSIS TO CENTRAL SICHUAN AND SOUTH SUINING AREAS

Chen Liping1, Zhu Shuliang1, Chen Liguan2, Cheng Guangying2   

  1. 1. The Mining Area in Central Sichuan, Sichuan Petroleum Administration;
    2. Chengdu College of Geology
  • Received:1981-11-21 Online:1983-06-25 Published:2012-01-16

摘要:

川中地区,东起华蓥山,西至龙泉山,南到合川、安岳,北至阆中、平昌,面积约四万平方公里。地表主要出露中、上侏罗统的红色泥、砂岩,层位由东南向西北渐次变新。本区处于"川中块状隆起"的中部,区内构造平缓,断层少见,是构造趋势面分析比较理想的地区。

Abstract:

Central Sichuan and south Suining areas,with quite flat structures,rare faults and superficial structures formed once by stress,are ideal regions for trend-surface analysis.Taking seismic structural maps corrected by drilling data as the basis,11 trend-surface equations and 41 maps are obtained by methods of gridded points and adding more well sites and abnormal points. After proper test and under 1% level of significance,quadratic equation has made more achievements than linear equation,and cubic equation even more than quadratic,showing remarkable fitting results.The linear trend surfaces in central Sichuan not only reflect regional dipping but also the old Indo-Sinian structures. The cubic trend surfaces not only reflect the main properties of recent structures,but alsothe old structures in late Caledonian. The quadratic and cubic trend surfaces in south Suining areas show that the areas are located at the turning apex of a anticline.The residual trend axes are parallel to lineament of structural pattern (high residual axes parallel to anticline axes and lower ones to that of syncline),and high residual axe are shifted slightly towards north due to regional tilting.Analysed the superficial structuer pattern in central Sichuan,the cubic trend residuals are selected for geological interpretation. The high residuals are normally the reflection of aeromagnetics,gravity anomalies or deep fractures. A Preliminary division is made on structural element of central Sichuan based upon the trend residuals.The fractures are well developed near the high residual axis lines. Distribution of commercial gas-sites within Xiangsi and Xianger gas pools in south Suining gas field coincide basically with the high residual axis lines on top of the Leikoupo Formation.