摘要
精确确定岩性圈闭尖灭点范围和位置可对油气勘探提供重要指导。通过分析渤中12构造区岩石物理参数,运用正演模拟技术探讨了下倾尖灭时岩性体尖灭点位置和范围与地震反射记录之间的关系。限定在渤中凹陷12构造区条件下,下倾尖灭时,实际尖灭点和地震记录的尖灭点之间的误差与地层夹角存在幂函数关系,当频率发生改变,这种幂函数关系不变,但频率与2个尖灭点之间的误差存在反函数关系。根据尖灭点外推原理沿着地震剖面上地震反射同相轴的变化趋势外推可较准确预测得到尖灭点的真实位置。利用该方法对渤海湾盆地渤中凹陷12构造区进行了实例分析,对比了辫状河三角洲BD2实际尖灭范围和预测尖灭范围,为下一步勘探提供了技术支持。
Accurately determining the boundary and the position of pinchout point has important meaning to guide petroleum prospecting. This paper discusses the relationship of stratigraphic dip angle between the locations and boundary of pinchout points and seismic record by using forward modeling method. Under the condition of the study area, there is a power function relationship between the error of recorded and predicted pinchout and stratigraphic dip angle under the 15 Hz seismic dominant frequency. When the seis- mic dominant frequency changes, the power function relationship remains the same. However, there is an inverse-function relation between frequency and error of recorded and predicted pinchouts. Extrapolating the changing trends of seismic reflection events can accurately determine the position of stratigraphic pin- chout points by the theory of pinchout extrapolation. The method was used to investigate the prograda- tional reflection zone in the lower part of Second Member of Dongying Formation, BZ12 Block, Bohai Bay Basin, and the comparison between the original and predicted pinchout ranges of braid delta BD2. This provides the technique support for the future exploration.
出处
《地质科技情报》
CAS
CSCD
北大核心
2017年第2期265-271,共7页
Geological Science and Technology Information
基金
国家科技重大专项"渤海南部古近系优质储层成因机理
综合评价技术与有利勘探方向研究"(2016ZX05024-003-007)
国家自然科学基金项目(41572084)
