石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2009年
6期
684-688,691
,共6页
回弹%收缩%压缩系数%膨胀系数%构造抬升%异常压力
迴彈%收縮%壓縮繫數%膨脹繫數%構造抬升%異常壓力
회탄%수축%압축계수%팽창계수%구조태승%이상압력
rebound%constringency%compressibility coefficient%expansion coefficient%tectonic uplifting%abnormal pressure
根据物理化学原理,建立了完全封闭条件下构造抬升剥蚀后地层流体压力的定量计算公式.公式显示,在完全封闭条件下构造抬升后的地层压力取决于抬升前的地层压力、地层流体的压缩系数、地层流体的膨胀系数、岩石孔隙体积的压缩系数、抬升前后地层温度的变化和剥蚀厚度.根据流体的压缩系数和膨胀系数及岩石孔隙体积压缩系数的特点,经分析认为对于水层砂岩岩体,构造抬升剥蚀趋向于形成异常低压;对于气层,构造抬升剥蚀趋向于形成异常高压.
根據物理化學原理,建立瞭完全封閉條件下構造抬升剝蝕後地層流體壓力的定量計算公式.公式顯示,在完全封閉條件下構造抬升後的地層壓力取決于抬升前的地層壓力、地層流體的壓縮繫數、地層流體的膨脹繫數、巖石孔隙體積的壓縮繫數、抬升前後地層溫度的變化和剝蝕厚度.根據流體的壓縮繫數和膨脹繫數及巖石孔隙體積壓縮繫數的特點,經分析認為對于水層砂巖巖體,構造抬升剝蝕趨嚮于形成異常低壓;對于氣層,構造抬升剝蝕趨嚮于形成異常高壓.
근거물이화학원리,건립료완전봉폐조건하구조태승박식후지층류체압력적정량계산공식.공식현시,재완전봉폐조건하구조태승후적지층압력취결우태승전적지층압력、지층류체적압축계수、지층류체적팽창계수、암석공극체적적압축계수、태승전후지층온도적변화화박식후도.근거류체적압축계수화팽창계수급암석공극체적압축계수적특점,경분석인위대우수층사암암체,구조태승박식추향우형성이상저압;대우기층,구조태승박식추향우형성이상고압.
Based on the principles of physical chemistry,a formula is established for quantitatively calculating formation fluid pressure after tectonic uplifting and erosion in a closed system.The calculation results with the formula show that formation pressure after tectonic uplifting and erosion in a closed system depends on such factors as initial formation pressure before tectonic uplifting,compressibility coefficient and expansion coefficient of formation fluid,compressibility coefficient of pore volume,temperature variation before and after uplifting,and erosion thickness.An analysis of compressibility coefficient and expansion coefficient of formation fluid as well as compressibility coefficient of pore volume reveals that an abnormal low pressure is likely to be formed in water-bearing sandstone formations,while an abnormal high pressure is more possible in gas-bearing formations after the uplifting.
