川东北地区礁滩相储层中泥灰岩识别

MARLSTONE IDENTIFICATION IN REEF FLAT FACIES RESERVOIRS IN NORTHEASTERN SICHUAN BASIN

川东北地区长兴组和飞仙关组地层广泛发育生物礁滩储层。长兴组顶部普遍发育一套厚度不等的潮坪白云岩；飞仙关组一段底部发育一套泥灰岩沉积，泥灰岩沉积厚度与长兴组潮坪白云岩厚度有密切关系，具有厚度薄、低波阻抗的特征。为了防止在储层预测中将泥灰岩作为储层，系统分析了泥灰岩的测井响应和地震响应特征；根据测井分析结果并考虑泥灰岩沉积环境，提出基于多属性的高分辨率非线性参数反演、地震波阻抗反演、交会图技术、沉积相和地震相分析相结合来识别礁滩相储层中泥灰岩的思路。通过实际资料的分析与应用，证实了该思路对识别具有储层特征的泥灰岩的有效性。

Reef flat facies reservoirs have been widely developed in Changxing Formation and Feixianguan Formation in Northeastern Sichuan basin. A group of tidal flat dolomite with different thickness develops in top Changxing Formation, and a group of marlstone sediments develops at the bottom of Member I of Feixianguan Formation, with thickness is closely related to that of tidal flat dolomite in Changxing Formation. Marlstone source rock has features of little thickness and low wave impedance inversion. To avoid the mistake that taking marlstone as reservoir, this paper analyzes on logging response and seismic response characteristics. Based on logging analysis and depositional environment of marlstone, it presents an idea of identifying marlstone in reef flat facie reservoir, combined with multi-attribute and high-resolution nonlinear parametric inversion, seismic acoustic impedance inversion, crossplot technique, as well as analysis on sedimentary facies and seismic facies, Research and application of real data proves its effectiveness in indentifying marlstone with reservoir characteristics.