苏北盆地中、上古生界分布预测

Prediction on the distribution of the Mesozoic and Upper Palaeozoic in Subei basin.

(中国石油化工股份有限公司江苏油田分公司地质科学研究院,江苏扬州225009)

Zheng Huafeng,Geological Research Institute,Jiangsu Oilfield Branch Company,SINOPEC,Yangzhou 225009,China

苏北盆地中、上古生界具有很好的烃源岩条件。由于受多期构造运动的改造和地震资料的限制,因此，关于该地区中、上古生界的构造特征、分布和保存程度的认识一直存有争议。为了进一步了解印支面下伏中、上古生界在全区的分布状况,尝试应用正、反演方法对研究区内印支面上、下地层接触关系进行预测。利用钻井资料制作一维正演模型精确标定印支面,应用一维正演模型，沿印支面进行地震属性的提取、相关性分析和聚类分析,从有井控制区反演出无井控制区的印支面上、下地层接触关系。通过对黄桥地区地震属性的剖析,在该区选取均方根振幅和能量半衰时进行聚类分析，得到了印支面上、下地层接触关系平面分布特征,该反演结果与邻区衔接很好。

The Mesozoic and Upper Palaeozoic have good hydrocarbon source rocks in Subei basin.However,suffered from the limitation of the seismic data and the reconstruction of multi-period tectonic movements,distribution and preservation of the Mesozoic and Upper Palaeozoic are controversial for years.In order to understand the distribution of the underlying Mesozoic and Upper Palaeozoic in the work area,we tried to adopt forward and inversion technologies to predict the contact relationship of upper and lower formations of Indosinian unconformity.By using drilling data,1D forward model was established to accurately calibrate Indosinian unconformity.Then the 1D forward model was applied to carry out seismic attributes extraction,coherence analysis and cluster inversion.Finally,the contact relationship of upper and lower formations of Indosinian unconformity at the area without well data was inverted by that of the area with wells.By analyzing the seismic attributes at Huangqiao area,we selected RMS amplitude and energy half-attenuation time for cluster inversion,and obtained the plane distribution of the contact relationship of upper and lower formations at Indosinian unconformity.The result matches well with the neighboring area.