兴马地区沙三段陆相深水重力流储层综合预测

Reservoir Characterization and Comprehensive Prediction of Nonmarine Deep Water Deposits for Sha-3 Member in Xingma Area

兴马地区位于辽河西部凹陷的中东部,经40年的勘探,沙二段以上地层已基本探明并投入生产。伴随勘探的深入,沙三段重力流砂体已成为深层岩性油藏勘探的重点,但由于重力流沉积砂泥混杂、横向变化快,地震资料主频和信噪比均较低,重力流砂体的储层特征和空间分布研究较为薄弱。层序地层学和地震储层预测是深层岩性油藏勘探的两大有效手段。通过建立研究区高精度层序地层格架,将沙三段划分为3个层序,重力流砂体集中发育在各层序的下部,且以层序SQ3最为发育。在层序地层格架内,综合地震属性、波形分类、分频属性、波阻抗反演等技术预测了重力流砂体的空间分布并优选出4个有利的岩性圈闭。经钻井证实,预测结果较为准确。该方法可为辽河西部凹陷及其他地区岩性油气藏的勘探提供借鉴。

The Xingma area is located in the mid-east of the western sag, Liaohe depression. The stratums above Sha-2 Formation have been confirmed and put into production after 40 years＂ exploration. With the exploration and research in depth, the gravity flow of deposited sand bodies of Sha-3 member becomes a focus in lithologic reservoirs exploration. Due to low dominant frequency, low signal- to-noise ratio, rapid lateral change, and high frequency of layering inter-bedding, the studies are few with respect to reservoir characteristic and spatial distributions. The sequence stratigrapic classification and seismic reservoir prediction skills are two effective methods in the lithologic reservoir exploration for deeper strata. The Sha-3 member is divided into three sequences after the high resolution sequence stratigraphic framework is built up. The sandstone bodies are mainly distributed at the bottom of each sequence and mostly developed in sequence SQ3. On the basis of an isochronous stratigraphic framework, the seismic attribute identification, seismic waveform classification, frequency division technique, post-stack seismic inversion, and the forecasting reservoir technique are used to choose four good lithologic traps. The prediction results are verified by the new well drilling data. The research provides a reference for lithologlc reservoir exploration in western sag, Liaohe depression and other areas.