Sub-layer division and correlation based on well-seismic combination and step-by-step interface constraint: A case study of the Taiyuan-Lower Shihezi Formation in the Shilijiahan of the Hangjinqi area
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摘要:
为了实现鄂尔多斯盆地北部杭锦旗十里加汗太原组—下石盒子组小层精细对比，通过详细的岩心观察，岩心–测井–地震紧密结合，利用岩心标定测井曲线，总结不同级次标志层序界面特征，利用逐级标志层序约束，井震结合进行高频层序划分，结合开发实际，进行小层划分对比。结果表明，研究区太原组—下石盒子组地层厚度在230 m左右，自下而上，由海陆过渡环境的潮坪相—三角洲相沉积，逐渐演变为山西组的辫状河三角洲相沉积，至下石盒子组则主要发育辫状河沉积。依据层序界面类型，将目的层识别出Ⅱ级界面1个，Ⅲ级界面3个，Ⅳ级界面4个。将Ⅱ-Ⅳ级层序界面按照岩心–测井曲线–地震响应特征的难易识别程度，划分了4个级次，进一步通过岩心–测井详细标定，识别V级界面25个。在地震剖面约束和沉积认识指导下，开展不同级别标志界面井间对比，进而逐级约束，实现高频层序对比，结合现场开发实际，将目的层划分为13个小层，各小层厚度较为稳定，主要反映了平原三角洲—辫状河沉积特征。高频层序一定程度上控制着沉积储层的发育与分布。通过井震结合、逐级约束的方法，可提高小层划分对比的准确度和精细度，为该区进一步的气藏地质研究与评价提供基础。
Abstract:This study aims to achieve fine correlation of sub-layers between wells in the Taiyuan-Lower Shihezi Formations in the Shilijiahan of the Hangjinqi area. Based on detailed core observations and core-log-seismic integration, calibrated logging curves are used to summarize the interface characteristics of different levels of marker beds, and high-frequency sequence division is performed by using step-by-step marker bed constraints and well-seismic combination. In combination with development practice, sub-layers division and comparison are carried out. The results indicate that the stratum thickness from the Taiyuan Formation to the Lower Shihezi Formation in the study area is about 230 meters. From bottom to top, the tidal flat facies and delta facies in the transitional environment between sea and land gradually evolved into the braided river delta facies of the Shanxi Formation, and the braided river deposits are mainly developed in the Lower Shihezi Formation. According to the sequence interface types, the target layer is identified as one second-order interface, three third-order interfaces and four fourth-order interfaces. Based on core, logging curve, and seismic response characteristics, the second-fourth order sequence interfaces are divided into four levels. Through detailed core-log calibration, 17-18 fifth-order interfaces are further identified. Under the constraint of seismic profile and the guidance of sedimentary characteristics, the inter-well correlation of different marker interface levels is conducted, and then the high-frequency sequence correlation is achieved by level-by-level constraint. In combination with the actual field development, the Taiyuan Formation to the Lower Shihezi Formation can be further divided into 13 sub-layers. The thickness of each sub-layer is relatively stable, primarily reflecting the sedimentary characteristics of plain braided rivers. High-frequency sequences control the development and distribution of sedimentary reservoirs to a certain extent. The well-seismic combination and step-by-step constraint method enhance the accuracy and fineness of sub-layer division and correlation, providing a foundation for further gas reservoir geological research and evaluation in this area.
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