CAJ | 학술논문

利用Archie公式计算储层含水饱和度时，岩性系数a和胶结指数m通常取区域某一固定值，但在致密砂岩储层实际应用中发现，地层因素和孔隙度的关系与典型的Archie公式特征不符，其相关性较差，通过不同的回归处理方法得到的a和m值有时相差较大。利用××油田致密砂岩储层14口井130块岩心岩电实验资料进行统计分析：不同井区确定的岩性系数a和胶结指数m具有很好的相关性，存在明显的幂函数关系，且a和m值变化范围很大，呈现高a低m的特征，强制将a近似为1与实际不符；地层因素和孔隙度在lg（ F）－lg（Ф）坐标系下，以三次函数关系拟合可以将整套实验数据统一起来，即m与lg（Ф）存在一元二次函数关系。通过对胶结指数m的机理分析，引入导电效率，采用数值模拟方法推导出了m的计算公式。通过对比分析，采用变a和变m计算的地层因素与岩电实验测试结果符合程度更高，有利于提高含油饱和度计算精度。
이용Archie공식계산저층함수포화도시，암성계수a화효결지수m통상취구역모일고정치，단재치밀사암저층실제응용중발현，지층인소화공극도적관계여전형적Archie공식특정불부，기상관성교차，통과불동적회귀처리방법득도적a화m치유시상차교대。이용××유전치밀사암저층14구정130괴암심암전실험자료진행통계분석：불동정구학정적암성계수a화효결지수m구유흔호적상관성，존재명현적멱함수관계，차a화m치변화범위흔대，정현고a저m적특정，강제장a근사위1여실제불부；지층인소화공극도재lg（ F）－lg（Ф）좌표계하，이삼차함수관계의합가이장정투실험수거통일기래，즉m여lg（Ф）존재일원이차함수관계。통과대효결지수m적궤리분석，인입도전효솔，채용수치모의방법추도출료m적계산공식。통과대비분석，채용변a화변m계산적지층인소여암전실험측시결과부합정도경고，유리우제고함유포화도계산정도。
When Archie formula is applied to calculate water saturation of the reservoir,the cementation exponent,m, and lithology factor,a,are usually taken at a fixed value in target area.But in tight sand reservoirs,the relationship between formation factor and porosity is different from Archie formula description,and the values of a and m calculated by various regression methods sometimes are different.Litho-electric experiment data of 130 cores taken from 14 wells were statisti-cally analyzed in tight sand reservoirs of ××oilfield.It was found that there was a power function between lithology fac-tor,a,and cementation exponent,m.The values of a and m have a large variation range,presenting a trend of bigger a and smaller m.The value of a was approximated one that was inconsistent with the actual.In logarithmic coordinate of formation factor and porosity,the cubic function is the best correlation,in other words,there is a quadratic function between m and logarithm of porosity.According to the mechanism analysis of cementation exponent,m,introducing electrical efficiency,a formula for m was derived by using mathematical simulation method.After comparison,it was indicated that the formation factors calculated by variables of a and m are more consistent with the litho-electric experiment data,which can improve the calculating precision of oil saturation.