摘要
在对浊流形成条件地质背景研究的基础上,应用水动力学模拟原理正演模拟了由不同粒级沉积物形成的浊流的几何形态,并通过与地震资料的对比来达到储层预测的目的.采用该方法分别对莺歌海和琼东南盆地的浊流沉积进行了模拟研究,模拟结果表明:①浊流发育的最理想的坡度是1.5～3.0°;②浊流沉积一般都会形成斜坡扇和盆底扇,且单个浊积体在坡角处沉积最厚,向盆地方向逐渐减薄;③在其它参数不变的情况下,固体颗粒越大,形成的浊积体越厚,但展布范围越小;固体颗粒越小,形成的浊积体越薄,但展布范围越大.模拟结果与钻井的实际情况吻合良好.
The recent hydrocarbon exploration in deep water indicates that the reservoir prediction has greatly restricted the exploration of lithologic reservoirs in lowstand fans.Because of the lack of wells,general constrained inversion by logs could not work.On the basis of studies on geological background where turbidities develop,this paper applies the theory of hydrodynamics to simulate the geometric shape of turbidites composed of different size particles.Compared with seismic reflectance signatures,the main granularity of lowstand fans can be estimated,which has been observed on seismic data.This method has been successfully applied to reservoir prediction in Yinggehai and Qiongdongnan Basins.Furthermore,the results of simulation show that:①the degree of slope where the turbidity is easy to develop is 1.5~3.0°;②the deposits of turbidities usually form slope fans and basin floor fans,and the single turbidite has the thickest segment in slope foot and is thinning down toward basin; ③if all other parameters have no changes,bigger sediment grain forms thicker and smaller turbidte and vice versa.
出处
《地质科技情报》
CAS
CSCD
北大核心
2005年第2期1-6,共6页
Geological Science and Technology Information
基金
国家重大基础研究发展规划项目(G2000046705)
