Abstract
Yingqiong basin is a proven hydrocarbon-rich basin in South China Sea. There are a number of large exploration prospects in high temperature and over-pressured formations, especially in Yacheng Block of Qiongdongnan basin and Dongfang District of Yinggehai Basin. Owing to good exploration situation, we have already achieved proven geological reserves over 1000 × 108 m3. In recent years, a few drilled HPHT wells have confirmed that pressure predicted by conventional method was wildly inaccurate. From the view of regional stress, the accuracy of the pressure prediction will be substantially improved. Accurate pressure prediction and three-dimensional pressure modeling which are based on three-dimensional lithology modeling are the cornerstone to achieve exploration breakthrough. In this paper, the use of the triple constraint trend lithology model broke through the traditional method of seismic lithology prediction only by means of impedance threshold value. Compared with actual data and prediction, it confirms that three-dimensional pressure modeling method is reasonable and effective, and has a wide prospect of application.
Highlights
Accurate pressure prediction and three-dimensional pressure modeling which are based on three-dimensional lithology modeling are the cornerstone to achieve exploration breakthrough
Yinggehai-Qiongdongnan Cenozoic sedimentary basins were rapidly subsiding basins, which were characterized by abnormal high temperature and high pressure
It’s necessary to construct a three-dimensional pressure model mainly controlled by lithology model but the traditional forecasting method is only based on lithologic seismic impedance threshold value [6] [7] [8] [9]
Summary
More than two thirds of the world’s sedimentary basins develop at different levels of overpressure, among which hydrocarbon distribution of about 160 sedimentary basins is closely genetically related. It’s necessary to construct a three-dimensional pressure model mainly controlled by lithology model but the traditional forecasting method is only based on lithologic seismic impedance threshold value [6] [7] [8] [9]. Diapir area affected by lithology and fuzzy band, impedance of sandstone and mudstone is difficult to predict its vertical and horizontal distribution characteristics, so this research applies triple trend constraint method to construct lithology model in the deep layers of Dongfang district, which overcomes the disadvantages of the single impedance properties and builds a high-precision lithologic model for the establishment of three-dimensional pressure model
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