论文部分内容阅读
在油田开发过程中,同一时期沉积的小层砂体,即单砂体,是油气开发的基本单元,也是储集层沉积旋回研究的主体。小层的划分和对比多以地层中出现的砂体为参照,而砂体在空间的分布通常是变化的,这就增加了小层划分的不确定性。本文采用自然伽马测井曲线,应用滑移窗频谱分析技术,通过鄯善油田多口井的对比分析,在三间房组S3砂层组识别出了6个旋回界面,5个高频旋回。旋回界面的出现与旋回波长的频谱峰特征突变界面相对应,而旋回波长受沉积物沉积速率的控制,与地层中岩性的变化以及砂体的发育没有直接关系,这解决了以岩性为标志划分油层的诸多问题。旋回的厚度在几米至十几米之间,与小层的沉积旋回级别十分接近,而且由沉积速率突变识别出的旋回界面在区域内具有等时性,划分出的高频旋回也可进行横向上的对比,可作为油田小层划分与对比的重要地质参数和依据。
During the process of oilfield development, small sandstones deposited in the same period, ie, single sand body, are the basic units for oil and gas development and the main body of reservoir sedimentary cycles. The division and contrast of the small layers mostly refer to the sand bodies appearing in the strata, and the distribution of the sand bodies in the space usually changes, which increases the uncertainty of the division of the small layers. In this paper, the natural gamma ray logging curve is used. By using the sliding window spectral analysis technique, through the comparative analysis of multiple wells in Shanshan Oilfield, six cycles of interface are identified in the S3 sand layer of the Sanjianfang Formation. Five high-frequency cycles . The appearance of the gyration interface corresponds to the abrupt change of the spectral peak of the recurrent wavelength. However, the gyration wavelength is controlled by the deposition rate of sediments, which is not directly related to the lithology change in the strata and the development of the sand body. This solves the problem that lithology Marking many problems of reservoir division. The thickness of the cycle is between a few meters and ten meters, very close to the sedimentary cycle level of the sublayer, and the gyration interface identified by the abrupt change in sedimentation rate is isochronous in the region. The divided high-frequency cycle can also be horizontally The comparison can be used as an important geological parameter and basis for the division and comparison of the oil layer.