【摘要】 靖边气田目前已进入自然稳产末期,气田稳产形势严峻,"沟槽挖潜"已成为气田产能建设的新亮点。从2015-2018年产建情况来看,在原评价沟槽区完钻59口井中28口井钻遇马五1+2主力气层,这表明原有的"东西向连续树枝状"沟槽展布模式已不再适合气田实际生产状况。新一轮沟槽刻画表明,"沟槽与潜坑并存"的"沟-坑模式"与实际生产更为吻合。为此,通过靖边气田北区沟槽研究实践,提出了一种基于"沟-坑模式"的沟槽识别与精细刻画新方法,即:(1)利用钻井、地震资料进行沟槽初步识别,确定沟槽、潜坑轮廓;(2)建立静态修正模型,对初步确定的沟槽、潜坑轮廓进行调整细化,落实分支沟形态;(3)建立动态验证模型,精细刻画沟槽、潜坑细微形态;采用上述方法在靖边气田北区共识别和精细刻画出4条主沟槽、42条分支沟槽、12个潜坑,与原沟槽展布相比,沟槽面积减少60%,为后续"沟槽挖潜"提供了空间。沟槽刻画成果通过现场钻探取得了较好的应用效果,表明该方法对靖边气田沟槽识别与精细刻画具有指导意义,对类似古岩溶气田沟槽识别具有借鉴意义。更多还原

【Abstract】 The Jingbian gas field has now entered the end of natural stable production, and the gas field has a severe production stabilization situation. "Tapping the potential in erosion grooves" has become a new highlight of gas field production capacity construction.From 2015 to 2018, 28 of 59 drilled wells in the originally evaluated groove area and encountered the main gas formation of Mawu 1+2. This shows that the original "east-west continuous dendritic" groove spread pattern is no longer suitable for the actual production conditions of the gas field.The new round of groove characterization shows that the "groove-pit model" of "groove and pit coexist" is more consistent with actual production.Therefore, a new method of groove recognition and fine characterization based on "groove-pit pattern" is proposed. First, preliminary identification of grooves using drilling and seismic data to determine the contours of grooves and pits. Second, establish a static correction model, adjust and refine the contours of the grooves and pits that are initially determined, and implement the branch grooves. Third, establish a dynamic verification model to finely describe the subtle shapes of grooves and pits.Using the above method, a total of 4 main grooves, 42 branch grooves and 12 erosion pits were identified and finely depicted in the northern area of Jingbian Gas Field. Compared with the original groove spread, the groove area has been reduced by 60%, providing space for the subsequent "groove tapping".The results of groove characterization have achieved good application results through on-site drilling, indicating that this method has guiding significance for groove identification and fine description of Jingbian gas field, and has reference significance for groove identification of similar ancient karst gas fields.更多还原