井震联合预测白云深水区海相烃源岩TOC

doi:10.6038/pg20160553

摘要/Abstract

摘要：

深水区受钻井资料少、中深层地震资料品质差和速度场求取困难等客观因素影响，常规的烃源岩预测方法受到限制.文章研究了白云深水区利用纵波阻抗与烃源岩TOC关系进行海相烃源岩预测的方法，提出了一种少井条件下井震联合预测烃源岩TOC的技术流程.首先，通过井曲线多属性融合技术预测连续的TOC曲线（TOC测井预测）；其次，将预测的TOC曲线与弹性参数交会分析，得到烃源岩TOC与纵波阻抗的拟合关系（烃源岩岩石物理分析）；然后引入无需井约束的高精度网格层析速度反演求取速度谱，用于波阻抗反演（地震反演）；最后基于拟合关系和波阻抗反演结果预测烃源岩品质.实际数据无井约束波阻抗反演结果与井上TOC曲线关系匹配较好，验证了井震联合预测方法的有效性.

Abstract:

With the increasing demand of energy and rapid development of science and technology, oil and gas exploration develop from land to ocean, from shallow water to deep water. Deep water is becoming a hot area of oil and gas exploration. Baiyun Sag has been proved to be a hydrocarbon-rich sag in deepwater area of northern South China Sea. The reservoir distributions are affected by many factors, the most important one of which in this area is the distribution and quality of source rocks. However, conventional source rocks prediction methods are limited in the deep water area, due to the less of drilling data, the poor quality of seismic data and difficulties in calculating the velocity field. To solve these problems and reduce the cost of exploration, a marine source rocks prediction method based on the relationship of P-wave impedance and the source rocks TOC in Baiyun deepwater area is studied in this paper. A technical workflow of joint logging and seismic method for TOC prediction under less well condition is proposed. The workflow consists of four steps. First of all, predict a continuous TOC curve with multiple attribute fusion technology (named TOC well prediction). In this paper, we use the "EMERGE" module of HRS software to optimize the selection of sensitive attributes. The logRT、DT and Sqrt (GR) are finally chosen to predict the continuous TOC curve. Secondly, establish the fitting relationship of predicted TOC curve and the elastic parameters by cross analysis (named rock physical analysis of source rocks). The cross analysis results indicate that, the P-wave velocity and P-wave impedance perform nonlinear decreasing with the increase of TOC, and the density performs linear decreasing. The rock physical analysis provides the foundation of predicting TOC with P-wave impedance. The third step, introduce the no well constrained high-precision grid tomographic velocity inversion technology to obtain velocity spectrum, which is used to calculate the p-wave impedance (named seismic inversion process). The no well constrained tomographic velocity inversion technology avoids the problem of less well data in deepwater, which limits the conventional seismic inversion. Finally, predict the source rocks distribution and organic matter abundance based on the fitting relationship and calculated p-wave impedance. The impedance inversion results have a good relation with observed TOC at well position, which verified the effective of the proposed method.

中图分类号:

P631

张益明, 韩利, 刘春成, 叶云飞. 2016. 井震联合预测白云深水区海相烃源岩TOC. 地球物理学进展, 31(5): 2270-2275. doi: 10.6038/pg20160553.

ZHANG Yi-ming, HAN Li, LIU Chun-cheng, YE Yun-fei. 2016. Marine source rocks TOC prediction with a joint logging and seismic method in Baiyun deepwater area. Progress in Geophysics. 31(5): 2270-2275. doi: 10.6038/pg20160553.

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