二连盆地阿北安山岩储层特征

CHARACTERISTICS OF ANDESITE RESERVOIR IN NORTH ALSEN, EREN BASIN

唐阶廷

Tang Jieting

阿北安山岩由3次火山爆发,至少12次岩浆喷溢形成,每次喷溢的熔岩层分为2-3个带,储层主要分布在上部1-2带内.喷溢亚相主流线,近火山口喷溢小相带,以及构造顶部孔隙较发育,共发育四类储集岩、七类孔隙和三类孔隙组合.低孔低渗,孔隙结构差,非均质性强,原始含水饱和度89%.相控生产比较明显,致使这类油藏的主要生产特点是初期就进入含水开采.

The andesite in north Alsen was formed by at least 12 magmatic eruptionsand 3 volcanic explosions. The lava beds of each eruption can be dividedinto 2-3 belts, and the reservoirs are mainly distributed in 1-2 belts of theupper part. Pores are developed at the main flow line of eruptive subfacies,the eruptive minor facies zone near the crater and structural topes, composedfour kinds of reservoir rocks: lava-flow autoclastic rocks, andesite conglome-rate, vesicular-amygdaloidal andesite and compact massive andesite, andconstituted seven kinds of pores and three pore assemblages. These reservoirsare characterized by low porosity-permeability, poor porous texture, highanisotropy. Original aqueous satuation is up to 89% and aqueous exploitaionstarted at the very beginning.

10.11743/ogg19880412