沉积相-岩性约束下的储层薄砂体展布预测方法

——WZ12-X油田为例

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中图分类号：P618 文献标识码：A 文章编号：2097-5465（2025）06-0059-06

Abstract：Currentreservoirsandbodypredictionwithintheindustryprimarilyreliesongeophysical methods．However，this approachdemands high-qualitydata，andpredictionaccuracyissignificantlycompromisedwhendealingwiththinsandbodies. Conversely，utilizingasedimentaryreservoirgeologicalknowledgebaseforsandbodypredictionsuffersfromlimitationssuchas single constraint conditions and substantial prediction erors.Addressing these challenges，this study focuses on the L2 Ⅱ b-7 thin sandlayerwithintheWZ12-Xoilfieldasthe target zone，proposinganovelmethodforpredictingsandbodygeometrybasedon sedimentaryfaciesandlithology.Thismethodisimplementedintreesteps：1）standardizedlogfaciesidentification：establishing unifiedgamma-raycurveparametersandverticalscalingcriteriabasedoncore-calibratedfaciestoidentifysedimentarymicrofacies oftargetanbodis；2）quantiativefcies-litogyknowledgedatabaseconstuction：folloingelloelaion，statisticaly analyzingextensiondistancesandthicknessesofsandbodieswithdenticalmicrofaciesandlithologyAnextensioncoeffient（α） isintroducedtoquantifysandbodycontinuity，enablingcalculationoforientation-specficwidth-thicknessratios；3）sadody delineation：drawingcircleswithwellpointsascentersandextensiondistances（derivedfromwidth-thicknessratios）asradiito mapsandodyboundaries.Validationusing109 individualsandbodiesfrom40wellsconfims themethod'sefectivenessforthin sandbodypredictioinsesmic-data-deficientsenarios.Citicalimplementationotes：with-cknessratiosatisticsustcout forrelationshipsbetweenwel-tieprofilesandprovenancedirections，whileaccuratelydiferentiatingmulti-stagesuperiposed sandbodies.

Keywords：sedimentary facies-lithologyconstrained；thin sandbody；distributionprediction

0 引言

行业内目前对于砂体的预测手段，主要是地球物理方法进行，近年兴起的分频技术（如RGB融合）、地震波形指示反演结合互相关驱动方法、时变分频反褶积技术等克服了常规地震反演对薄砂体预测的局限性[1-5]，同时结合沉积旋回约束、沉积储层地质知识库、相控地质统计学、测井耦合分频反演等相关专业技术开展综合研究[6-10]，从多维度上进行约束从而提高预测精度。（剩余5238字）