CAJ | 학술논문

在喜山期构造运动影响下，云南地区形成众多断陷盆地和拉分盆地。保山盆地和曲靖盆地是已经取得油气勘探突破的两个断陷盆地。两个盆地形态相似，均为受控盆断裂拉张、坳陷形成的一侧陡坡、一侧缓坡的箕状盆地。盆地演化均经历了拉张期、断陷期、坳陷期和抬升消亡期4个阶段。曲靖盆地受喜山运动二幕影响，缺失中新统地层沉积。烃源岩主要由盆地断陷和坳陷期半深湖-深湖相暗色泥岩和沼泽平原相煤系地层组成，有机碳含量1%~2%，有机质成熟度低。储层主要由盆地陡坡带冲洪积砂砾岩、三角洲前缘砂岩和三角洲平原水下分支河道砂体组成，具有高孔隙度低渗透率特点。鉴于断陷盆地烃源岩和储集层分布规律，在油气勘探过程中除了寻找有利的构造气藏外，应注重生烃坳陷内寻找有利的岩性气藏，有利相带为靠近陡坡带的冲洪积相和缓坡带的三角洲前缘相。
재희산기구조운동영향하，운남지구형성음다단함분지화랍분분지。보산분지화곡정분지시이경취득유기감탐돌파적량개단함분지。량개분지형태상사，균위수공분단렬랍장、요함형성적일측두파、일측완파적기상분지。분지연화균경력료랍장기、단함기、요함기화태승소망기4개계단。곡정분지수희산운동이막영향，결실중신통지층침적。경원암주요유분지단함화요함기반심호-심호상암색니암화소택평원상매계지층조성，유궤탄함량1%~2%，유궤질성숙도저。저층주요유분지두파대충홍적사력암、삼각주전연사암화삼각주평원수하분지하도사체조성，구유고공극도저삼투솔특점。감우단함분지경원암화저집층분포규률，재유기감탐과정중제료심조유리적구조기장외，응주중생경요함내심조유리적암성기장，유리상대위고근두파대적충홍적상화완파대적삼각주전연상。
There are a lot of fault basins and pull-apart basins created by the Himalayan orogeny in Yunnan, among which the Baoshan and Qujing Basins have similar features and witnessed, without exception, four evolutionary stages of extension, rift faulting, downwarping and uplifting/collapse. Influenced by the second episode of the Himalayan orogeny, the Miocene deposits are absent in the Qujing Basin. The source rocks consist primarily of bathyal-abyssal dark mudstones and marshland plain coal measures generated during the rift faulting and downwarping stages of the basin. The organic carbon contents only range between 1% and 2%, and the organic carbon maturity is relatively low. The reservoir rocks are mainly made up of steep slope alluvial-pluvial sandstones and conglomerates, delta front sandstones and delta plain subaqueous distributary channel sandstones, with higher porosity and lower permeability. Except structural gas reservoirs, particular attention should be drawn to the favourable lithologic gas reservoirs in the alluvial-pluvial facies near the steep slope zones and delta front facies in the ramp zones.