中国煤炭地质
中國煤炭地質
중국매탄지질
COAL GEOLOGY OF CHINA
2015年
2期
26-31
,共6页
太原组%页岩气%河西走廊
太原組%頁巖氣%河西走廊
태원조%혈암기%하서주랑
Taiyuan Formation%shale gas%Hexi Corridor
甘肃河西走廊地区上古生界太原组发育了一套海陆交互相煤系泥页岩，选取有机质丰度及种类、成熟度、有效页岩单层厚度、埋深、储层物性、页岩含气性6项指标对页岩气成藏前景进行评价。研究发现：研究区有效页岩单层厚度平均大于50m，最厚可达120m；TOC平均为3.76%；有机质类型以Ⅱ型为主，含少量Ⅲ型；镜质体反射率（Ro）平均为2.77%，属于过成熟阶段，有利于有机质热解生气，具备页岩气成藏的基本地质条件。页岩中粘土矿物含量平均为24.6%，脆性矿物含量平均为69.5%；孔隙度平均为2.88%，渗透率平均为0.094×10-3μm2。泥页岩吸附含气量平均为1.33m3/t。综合分析认为河西走廊中东部地区上古生界太原组页岩具有较好的页岩气勘探潜力。
甘肅河西走廊地區上古生界太原組髮育瞭一套海陸交互相煤繫泥頁巖，選取有機質豐度及種類、成熟度、有效頁巖單層厚度、埋深、儲層物性、頁巖含氣性6項指標對頁巖氣成藏前景進行評價。研究髮現：研究區有效頁巖單層厚度平均大于50m，最厚可達120m；TOC平均為3.76%；有機質類型以Ⅱ型為主，含少量Ⅲ型；鏡質體反射率（Ro）平均為2.77%，屬于過成熟階段，有利于有機質熱解生氣，具備頁巖氣成藏的基本地質條件。頁巖中粘土礦物含量平均為24.6%，脆性礦物含量平均為69.5%；孔隙度平均為2.88%，滲透率平均為0.094×10-3μm2。泥頁巖吸附含氣量平均為1.33m3/t。綜閤分析認為河西走廊中東部地區上古生界太原組頁巖具有較好的頁巖氣勘探潛力。
감숙하서주랑지구상고생계태원조발육료일투해륙교호상매계니혈암，선취유궤질봉도급충류、성숙도、유효혈암단층후도、매심、저층물성、혈암함기성6항지표대혈암기성장전경진행평개。연구발현：연구구유효혈암단층후도평균대우50m，최후가체120m；TOC평균위3.76%；유궤질류형이Ⅱ형위주，함소량Ⅲ형；경질체반사솔（Ro）평균위2.77%，속우과성숙계단，유리우유궤질열해생기，구비혈암기성장적기본지질조건。혈암중점토광물함량평균위24.6%，취성광물함량평균위69.5%；공극도평균위2.88%，삼투솔평균위0.094×10-3μm2。니혈암흡부함기량평균위1.33m3/t。종합분석인위하서주랑중동부지구상고생계태원조혈암구유교호적혈암기감탐잠력。
A set of upper Paleozoic Taiyuan Formation alternating marine-terrestrial facies coal measures argillutite have been devel?oped in Hexi Corridor area, Gansu;based on 6 indices of organic matter abundance and category, maturity, effective shale single layer thickness, buried depth, reservoir physical property and shale gas-bearing property carried out shale gas reservoiring prospect evalua?tion. The study has shown:the average effective shale single layer is thicker than 50m, maximum 120m;average TOC 3.76%;organic matter type mainly type II, a little type III;vitrinite reflectance (Ro) average 2.77%, in overmature stage, in favor of organic matter pyro?lytic gas generation, thus provided with basic geological condition for shale gas reservoiring. Average clay minerals content in shale is 24.6%; brittle minerals 69.5%; average porosity 2.88%, permeability 0.094 × 10-3μm2. Average argillutite adsorbed gas content is 1.33m3/t. From the comprehensively analyzed result studies have considered that the upper Paleozoic Taiyuan Formation shale in mid?dle-eastern Hexi Corridor area has good shale gas exploration potential.
