摘要
南华北盆地通许地区上古生界石炭系—二叠系保存较全,天然气成藏条件与鄂尔多斯盆地类似。运用鄂尔多斯盆地致密砂岩气藏成藏理论,分析南华北盆地通许地区上古生界基本油气地质条件、圈闭形成期与天然气运聚成藏期的匹配关系,明确该区天然气勘探前景。研究表明：通许地区石炭系—二叠系发育一套良好的区域性烃源岩,煤层发育,平均有机碳的质量分数为62.9%,平均有机质成熟度为3.34%,有机质类型属于Ⅱ2型;储集岩主要为大面积分布的三角洲平原分流河道砂岩,平均孔隙度为2.7%,平均渗透率为2.25 m D,发育粒间孔和粒间溶孔;上、下石盒子组泥岩发育,饱和气时突破压力为5.88~9.80 MPa,是良好的区域性盖层;致密砂岩岩性圈闭为该区最有利的圈闭类型;圈闭形成于烃源岩主生排烃期以前,源-储匹配关系好,具有良好的致密砂岩气勘探前景;尉北缓坡中南部是致密砂岩岩性圈闭气藏发育的有利区。
The Carboniferous and Pemlian strata in Tongxu area of southern North China Basin are relatively complete preserved. The natural gas reservoir conditions are similar to those of the Ordos Basin. Based on the theory of tight sandstone gas reservoir fonning in Ordos Basin, the basic petroleum geological conditions and the relationship between trap formation period and gas migration and accumulation period of the Upper Paleozoie were analyzed, then the gas exploration prospects of this area can be explieit. The research shows that the coal of Carboniferous and Permian in Tongxu area is well developed, the average organic carbon content of coal is 62.9%, the average maturity of organic matter is 3.34%, and the organic matter of coal belongs to Ⅱ2 type, which is a good regional source rock. Reservoir rocks mainly distributed in a large area of delta plain distributary channel sandstone, and average porosity is 2.7%, the average permeability is 2.25 roD, and intergranular pore and intergranular dissolved pore are developed. Mudstone of Upper and Lower Shihezi Formation is developed. The breakthrough pressure of mudstone saturated with gas is 5.88-9.80 MPa, and it is a good regional cap rock. The tight sandstone lithologie trap is the most favorable trap type, and it formed before the hydrocarbon generation, and the matching relationship is good. The central and southern area of the Weibei Slope is favorable for the development of tight sandstone lithologic gas reservoir.
出处
《岩性油气藏》
CSCD
北大核心
2016年第2期33-40,共8页
Lithologic Reservoirs
基金
中国石化华北油气分公司勘探综合研究项目“通许探区古生界天然气勘探目标综合评价”(编号:KT-2014-DZ005)资助
关键词
通许隆起
岩性圈闭
致密砂岩气
勘探前景
通许地区
南华北盆地
Tongxu Uplift
lithologic traps
tight sandstone gas
exploration prospects
Tongxu area
southen North China Basin
