CAJ | 학술논문

采用变胶结指数 m 和饱和度指数n 的阿尔奇公式仍是目前定量评价低阻油层饱和度的主要方法之一。然而，由于不同地区低阻油层的成因不同，从而使得低阻油层 m 和n 的影响因素随地区不同而发生变化。因此，针对不同地区低阻油层，有必要研究其阿尔奇公式 m 和n 的影响因素及变化规律。依据古龙南地区葡萄花低电阻率油层划分标准以及考虑岩性、物性、电性变化，选取了低阻油层岩样，设计了岩样岩石物理实验。基于岩石物理实验数据，绘制 m 和n 与物性参数、孔隙结构参数、黏土附加导电能力参数的交会图。经分析可知：低阻油层的 m 和n 值小于常规油层的m 和n 值，并随孔渗综合指数、中值半径、平均半径、半径均值的增大而增大。低阻油层的 m 值随泥质体积分数、阳离子交换容量、微孔隙体积与可动流体体积之比的增大而减小，随核磁共振测量的 T 2几何平均值的增加而增大；n 值随孔隙度、孔隙度和泥质体积分数比值的增加而增大。低阻油层的 m 值与T 2几何平均值、微孔隙体积与可动流体体积之比关系较好，n 值与孔渗综合指数、平均半径、最大半径、半径均值的相关性非常好。研究表明，低阻油层的 m 值受孔隙结构和泥的影响较大，而 n 受孔隙结构影响较大。可用 T 2几何平均值或微孔隙体积与可动流体体积之比确定低阻油层的 m 值，可用孔渗综合指数、平均半径、最大半径、半径均值确定低阻油层的 n 值。
채용변효결지수 m 화포화도지수n 적아이기공식잉시목전정량평개저조유층포화도적주요방법지일。연이，유우불동지구저조유층적성인불동，종이사득저조유층 m 화n 적영향인소수지구불동이발생변화。인차，침대불동지구저조유층，유필요연구기아이기공식 m 화n 적영향인소급변화규률。의거고룡남지구포도화저전조솔유층화분표준이급고필암성、물성、전성변화，선취료저조유층암양，설계료암양암석물리실험。기우암석물리실험수거，회제 m 화n 여물성삼수、공극결구삼수、점토부가도전능력삼수적교회도。경분석가지：저조유층적 m 화n 치소우상규유층적m 화n 치，병수공삼종합지수、중치반경、평균반경、반경균치적증대이증대。저조유층적 m 치수니질체적분수、양리자교환용량、미공극체적여가동류체체적지비적증대이감소，수핵자공진측량적 T 2궤하평균치적증가이증대；n 치수공극도、공극도화니질체적분수비치적증가이증대。저조유층적 m 치여T 2궤하평균치、미공극체적여가동류체체적지비관계교호，n 치여공삼종합지수、평균반경、최대반경、반경균치적상관성비상호。연구표명，저조유층적 m 치수공극결구화니적영향교대，이 n 수공극결구영향교대。가용 T 2궤하평균치혹미공극체적여가동류체체적지비학정저조유층적 m 치，가용공삼종합지수、평균반경、최대반경、반경균치학정저조유층적 n 치。
At present,Archie’s formula with variable cementation exponent (m )and saturation exponent(n)is still applied in quantitative evaluation of saturation of low resistivity oil reservoirs as one of the main methods.However,the influencing factors of m and n in low resistivity oil reservoirs are varied with area due to the different causes of low resistivity oil reservoirs.Therefore,the study on influencing factors and variation laws of m and n in Archie’s formula in low resistivity oil reservoirs in different areas is necessary.Samples of low resistivity oil reservoirs are cored in Putaohua Formation of southern Golong area according to division standard of low resistivity oil reservoirs,and also have definite variation of lithology,physical property,electric property.Then,petrophysical experiment of one sample is designed.A plot of m and n with parameters of petrophysics,pore structure,excess clay conductivity is made from petrophysical experiment data.The analysis shows that the values of m and n in low resistivity oil reservoirs is less than those of m and n in conventional oil reservoirs,and m and n in low resistivity oil reservoirs increase as porosity and permeability composite index,median radius,mean radius,radius mean increase.The m of low resistivity oil reservoirs decreases as shale volume fraction, cation exchange capacity, the ratio of micropore volume and movable fluid volume increase, and increases as T 2 geometric mean value increases,while the n of low resistivity oil reservoirs increases as porosity,the ratio of porosity and shale volume fraction increase.The m has a good correlation with T 2 geometric mean value,the ratio of micropore volume and movable fluid volume in low resistivity oil reservoirs,while the n has an excellent correlation with porosity and permeability composite index, mean radius,maximum radius,radius mean.The result reveals that pore structure has a larger effect on m and n of low resistivity oil reservoirs,and also shale volume fraction has a larger effect on m of low resistivity oil reservoirs,and T 2 geometric mean value or the ratio of micropore volume and movable fluid volume can be used to determine the m of low resistivity oil reservoirs, and porosity and permeability composite index,average radius,maximum radius,radius mean can be used to determine the n of low resistivity oil reservoirs.