摘要
鄂尔多斯盆地石炭二叠系形成于陆缘障壁海→三角洲→河流→湖沼的沉积环境，自下而上构成一个由石英砂岩→岩屑石英砂岩→岩屑砂岩的沉积序列。本溪组、太原组、山西组、下石盒子组又各自由三个次一级的沉积序列组成。河道砂体和三角洲前缘砂体是有利于天然气富集的储集体，储集空间可归纳为：大孔粗喉型（Ⅰ）、大孔细喉型（Ⅱ）、小孔细喉型（Ⅲ）和细孔微喉型（Ⅳ）四类。Ⅰ类占１１９１，Ⅱ类占５０５３，Ⅲ类占２８０６，Ⅳ类占９５，工业气流一般都形成在前三类储层孔隙中。
Abstract The CarboniferousPermian System in Ordos Basin was formed in marginal barrier sea→delta→river→limnetic environment,and constitute a sedimentary sequence of silicarenite→detrital silicarenite→clastic sandstone in ascending order.The Benxi,Taiyuan,Shanxi Formations of the System are composed respectively of three subsequences.River channel sandbodies and deltaic front sandbodies are favourable reservoirs for natural gas;the reservoir spaces of the reservoirs could be classfied into four types such as big porecoarse throat type(I),big porefine throat type(Ⅱ),small porefine throat type(Ⅲ)and fine proeminimal throat ytpe(Ⅳ).Among them,typeI occupies 11190/0,typeⅡ occupies 50530/0,typeⅢ occupies 28060/0 and typeⅣ occupies 950/0.Commercial gas flows are usually preserved in the first three types.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1998年第2期136-141,共6页
Oil & Gas Geology
