UPPER PALEOZOIC SEQUENCE STRATIGRAPHIC FRAMEWORK AND SOURCE-RESERVOIR-CAP CHARACTERISTICS IN EASTERN LIAONING PROVINCE
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摘要:
辽东地区上古生界石炭系-二叠系发育较齐全. 在区域构造沉积演化、岩石组合特征、沉积相分析等研究基础上, 运用层序地层学理论和方法, 对辽东地区上古生界进行层序地层研究. 将石炭系本溪组-二叠系蛤蟆山组划分为1个超层序、6个层序, 分别发育于陆表海、滨岸、三角洲及河流沉积背景下. 通过建立区域层序地层格架, 探讨在层序地层格架内以体系域为单位的生储盖组合发育特征, 认为上古生界区域性烃源岩和盖层主要形成于凝缩段和水进体系域上部、高位体系域下部, 有利储层主要发育在低位体系域和水进体系域, 纵向上构成2种类型5套生储盖组合, 其中山西组"自生自储型"为上古生界致密砂岩气最有利的组合类型.
Abstract:The Upper Paleozoic Carboniferous-Permian strata are well developed in eastern Liaoning Province. Based on the regional tectonic sedimentary evolution, rock association characteristics and sedimentary facies analysis, the paper studies the sequence stratigraphy of Upper Paleozoic in eastern Liaoning with the theory and method of sequence stratigraphy. The Carboniferous Benxi Formation-Permian Hamashan Formation is recognized as 1 supersequence including 6 sequences, which are developed in epicontinental sea, shoreland, delta and fluvial sedimentary setting respectively. By establishing the regional sequence stratigraphic framework, the paper discusses the development characteristics of source-reservoir-cap assemblages with system tract as unit in the sequence stratigraphic framework. It is considered that the Upper Paleozoic regional source rocks and caps were mainly formed in the condensed section and upper transgressive system tract, and the lower highstand system tract, with the favorable reservoirs mainly developed in the lowstand and transgressive system tracts, forming two types, five sets of source-reservoir-cap combinations vertically, among which the self-generation and self-reservoir type of Shanxi Formation is the most favorable assemblage of Upper Paleozoic tight sandstone gas.
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表 1 辽东地区上古生界烃源岩参数表
Table 1. Parameters of Upper Paleozoic source rocks in eastern Liaoning Province
层位 岩性 TOC（平均）/% 氯仿沥青“A”（平均）/% 生烃潜量（平均）/10-3 Ro/% 有机质类型 综合评价 山西组上段 泥岩 2.95 0.011 0.7 2.31 Ⅱ—Ⅲ 好 煤 45.8 7.34 山西组下段 泥岩 3.31 0.01 0.63 2.35 Ⅱ—Ⅲ 极好—好 煤 58.2 15.28 太原组 泥岩 0.78 0.00995 0.12 2.42 Ⅱ—Ⅲ 中等 
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表 2 辽东地区上古生界储层参数表
Table 2. Parameters of Upper Paleozoic reservoirs in eastern Liaoning Province
层位 岩性 孔隙度/% 孔隙类型 渗透率/mD 综合评价 石盒子组彩家段 长石岩屑砂岩 1.6~9.0 残余粒间孔、岩屑溶孔 0.01~0.1 超低孔、超低渗 石盒子组柳塘段 长石岩屑砂岩 2.4~5.1 残余粒间孔、粒内溶孔 山西组上段 石英砂岩、长石岩屑砂岩 2.5~4.6 粒内溶孔、残余粒间孔 山西组下段 岩屑砂岩、岩屑石英砂岩 2.7~3.6 晶内溶孔 本溪组 含砾岩屑石英砂岩 2.6~3.6 残余粒间孔、粒内溶孔
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