| 西部凹陷南部沙三段储层沉积特征及含油气性分析 |
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| 引用本文： | 鞠俊成,张凤莲,喻国凡,于天才.西部凹陷南部沙三段储层沉积特征及含油气性分析[J].古地理学报,2001,3(1):63-70. |
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| 作者姓名： | 鞠俊成 张凤莲 喻国凡 于天才 |
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| 作者单位： | 中国石油辽河油田公司勘探开发研究院 盘锦 124010 |
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| 摘 要： | 西部凹陷南部为辽河油田的重点探区之一，具有十分优越的石油地质条件。本区在沙三期断陷活动强烈，发育了巨厚的深水泥岩和多期次缓坡型湖底扇沉积，为油气聚集成藏提供了丰富的油气源条件和储集条件。沙三段沉积时期，在西部凹陷南部发育有齐家-杜家台和锦州-欢喜岭两大湖底扇沉积体系。受物源区的距离、基底构造和主干断层活动的控制，湖底扇平面上具有分带性，可划分为内扇、中扇和外扇三个亚相带。齐杜和锦欢湖底扇在沙三早期规模较小，中期规模最大，晚期萎缩。本区沙三段储层物性普遍较差，以低孔-低渗、特低孔-特低渗储层为主，其中湖底扇中扇辫状沟道微相砂体储集性能最好，平面上依中扇辫状沟道→中扇前缘→外扇亚相储层物性由好变差。储集性能的优劣主要受母岩区岩性、沉积作用、成岩作用等多种因素控制。沙三段湖底扇砂体在区内分布广泛，处于成熟生油岩的包围之中，位于油气运移的有利指向上，成藏条件优越，勘探前景广阔。
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| 关 键 词： | 辽河盆地 沉积特征 含油气性分析 沙三段 储集性能 勘探前景 |
| 修稿时间： | 2000年9月4日 |
DEPOSITIONAL CHARACTERISTICS AND HYDROCARBON ACCUMULATION OF THE THIRD MEMBER OF SHAHEJIE FORMATION RESERVOIR IN THE SOUTHERN WEST DEPRESSION, LIAOHE BASIN |
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| Ju Juncheng Zhang Fenglian Yu Guofan Yu Tiancai Section of Basin Research,Research Institute of Exploration and Development,Liaohe Oil Company.DEPOSITIONAL CHARACTERISTICS AND HYDROCARBON ACCUMULATION OF THE THIRD MEMBER OF SHAHEJIE FORMATION RESERVOIR IN THE SOUTHERN WEST DEPRESSION, LIAOHE BASIN[J].Journal of Palaeogeography,2001,3(1):63-70. |
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| Authors: | Ju Juncheng Zhang Fenglian Yu Guofan Yu Tiancai Section of Basin Research Research Institute of Exploration and Development Liaohe Oil Company |
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| Institution: | Exploration and Development Institute of Liaohe Oil Company, CNPC, Panjin, Liaoning 124010 |
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| Abstract: | The southern West Depression of the Liaohe Basin has been developed with favorable geological conditions for oil and gas accumulation and thus is an important exploration area of the Liaohe Oil Company. In the Shasan (the third member of Shahejie Formation of the Palaeogene) age, huge deep water mudstone and multiple low angle sloped lake floor fan sediments were deposited as a result of active faulting and subsiding. These deposits have provided abundant hydrocarbon source rocks and reservoirs for the formation of oil and gas pools. During this period, the Qijia Dujiatai and Jinzhou Huanxiling lake floor fan depositional systems were developed in the southern West Depression. Controlled by the distance to the terrigenous province, basement structure and main faults, these lake floor fans can be subdivided into three subfacies,i.e. inner fan, middle fan and outer fan. Both of these lake floor fans have smaller scale in the early Shasan age, largest scale in the middle Shasan age and decreased scale in the late Shasan age. The properties of the Shasan reservoir are very poor in the study area, which are characterized by low porosity permeability, extremely low porosity permeability. The best reservoirs of lake floor fan are the sandbodies of the middle fan braided channel microfacies, and reservoir properties decrease from the middle fan braided channel deposits through the middle fan front to the outer fan deposits. Reservoir characteristics are mainly controlled by lithology of parent rocks, deposition and diagenesis. The Shasan lake floor fan sandbodies distributed widely in the study area are surrounded by mature hydrocarbon source rocks and are located at the beneficial direction of oil and gas migration, hence having a promising exploration potential. |
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| Keywords: | Liaohe Basin southern West Depression third member of Shahejie Formation lake floor fan braided channel reservoir properties exploration potential |
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