11-油藏开发过程中断层完整性评价方法及应用-1.docx

油藏开发过程中断层完整性评价方法及应用

——以辽河盆地西部凹陷雷64油藏为例

摘要：断层型油藏注采开发过程中，外界流体注入使油藏内部压力系统发生扰动，可能诱使静态地质结构-断层完整性被破坏，致使原油沿断裂垂向渗漏污染环境，或侧向渗漏散失，原油产能下降。因此，为了保障油藏能够安全且高效的生产开发，本文以辽河西部凹陷雷64区块为例，在断层完整性机理的基础上，考虑断层完整性的影响因素，定量表征断层侧向和垂向完整性破坏的临界条件，研究结果表明：雷64-28-22油藏和雷64-22-16油藏断层侧向封闭压差分别为0.2-0.93MPa和0.2-0.88MPa，而控藏断层再活化附加流体压力阈值分别为9.1MPa和8.1MPa，并与油藏注入井油压对比，揭示无论雷64-28-22油藏还是雷64-22-16油藏皆是控藏断层侧向封闭失效，但垂向未发生再活动，断层完整性一般。

关键词：断层封闭机理，断层再活化机理，断层完整性影响因素，完整性定量评价

Abstract：Duringtheinjectionandproductionprocessoffaulttypeoilreservoirs,externalfluidinjectioncausesdisturbancetotheinternalpressuresystemofthereservoir,whichmayleadtothedestructionofthestaticgeologicalstructurefaultintegrity,causingverticalleakageofcrudeoilalongthefaulttopollutetheenvironment,orlateralleakagetodissipate,resultinginadecreaseincrudeoilproductioncapacity.Therefore,inordertoensurethesafeandefficientproductionanddevelopmentofoilreservoirs,thisarticletakestheLei64blockinthewesterndepressionofLiaoheRiverasanexample.Basedonthemechanismoffaultintegrity,theinfluencingfactorsoffaultintegrityareconsidered,andthecriticalconditionsforlateralandverticalintegritydamageoffaultsarequantitativelycharacterized.TheresearchresultsshowthatthelateralsealingpressuredifferenceoffaultsintheLei64-28-22andLei64-22-16reservoirsare0.2-0.93MPaand0.2-0.88MPa,respectively,whiletheadditionalfluidpressurethresholdsforreactivationofcontrolfaultsare9.1MPaand8.1MPa,andcomparedwiththeoilpressureofinjectionwellsinthereservoir.ItisrevealedthatboththeLei64-28-22andLei64-22-16reservoirshavefailedlateralsealingofcontrolfaults,buttheverticalsealingpressuredifferenceisnotsignificant.Nofurtheractivityhasoccurred,andtheintegrityofthefaultisaverage.

Keywords:Faultsealingmechanism,Faultreactivationmechanism,Factorsaffectingfaultintegrity,Quantitativeevaluation