摘要
陇川新第三纪盆地面积４７５ｋｍ２（含国外３４ｋｍ２）。经研究碎屑岩储层特征认为：（１）具备较好的层状─透镜状砂砾岩体，较有利的储集相带（滨湖─滨浅湖相广泛发育）和较厚的储集岩体。（２）因受胶结、交代、溶解、充填等作用，而产生次生孔隙和留存很多原生孔隙，为油气提供了储集空间。（３）据Ｒｏ煤（０．５９６％）、古地温（９５．４℃）、Ｓ层％（３５％）、最大热解温度（４３５℃）、石英次生加大（Ⅱ级）、重矿物组合（中等稳定─稳定）等分析，成岩阶段已进入晚成岩“Ａ”阶段，即有机质已由未成熟─成熟，开始向石油转化。与正进行勘探开发的云南景谷盆地相似。（４）分选中等、矿物成熟度低、杂基含量高且成份复杂（有蒙皂石、伊利石、高岭石、绿泥石等）以及微孔隙发育，缺少较大孔隙，裂缝不发育等原因，造成高孔隙低渗透型储层物性特点。
The area of the Longchuan Neogene Basin is 475 km2 including 34km2 abroad. Accoding to the study, the charcteristics of the clastic rock reservoir are as follows:(1) There are better bedded-lenticular sandy-gravel rocks, more advantageous reservoir facies belt and thicker reservoir rock beds.(2) The secondary pores formed by cementation, metasomatism, solution and filling,etc. , and many original poresremained provide the reservoir space to oil and gas.(3) According to Ro of coal (0. 596%), paleothermometry (95. 4℃), S bed % (35%) ,maximum heat decomposition temperature (435℃), secondary increase of quartz (Ⅱ) , heavy mineral assemblage (medium-stable), etc., the diagenetic stage belongs to the late diagenetic 'A' stage, ie. organic matters has behun to transform into petroleum fromimmature-mature ones, which is similar to that of Jinggu Basin being explored and exploited.(4) The character of reservoir is the high porosity but low permeability type because of medium-sorting, lowmaturity of mineral, high concentration and complex composition of matrix, development of micro-pore, few of largepore and fracture, etc.
出处
《云南地质》
1994年第1期57-67,共11页
Yunnan Geology
