微小断层识别及其对窄薄砂体油田开发的影响
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摘要
葡萄花油田南部(以下简称葡南油田)构造上处于松辽盆地中央坳陷大庆长垣二级构造带南部的三级构造——葡萄花构造向南延伸的部分。三维地震构造解释前的钻井资料证实,区内共有断层39条,均为正断层,断层倾角45°～50°,断距均大于10 m,断层延伸长度大于3 km,该油田1984年投入开发,截至2002年底,油田综合含水73.51％,采出程度28.1％,开发效果较好。但由于目前油田开发进入高含水期开采阶段,为了定量预测剩余油分布、精细方案调整,2002年开展了三维高分辨率地震精细构造、微小断层解释研究,发现了648条微小断层,为此以葡南油田为例,从微小断层研究入手,论证了断距5 m左右微小断层存在的可靠性,并用开发动态数据证实微小断层对窄薄砂体油田注水开发和套管损坏等方面具有较大影响。
The south of Putaohua oilfield lies in extention part of Putaohua structure toward the south, which is a third-level structure of the south of the secondary structural belt of Daqing placantieline of the central depression of Songliao basin. Drilling data verifies that there are 39 faults that all of them are normal faults, angle of them are 450°-50°. offset of them is over 10 m, and extention length of them is over 3 km. This oilfield has been developed since 1984 and the effect of oilfield development is good, which water cut is 73.51% and recovery percent of OOIP is 28. 1% at the end of 2002. Integrated researches of characteristic structure and micro-small fault interpretation by 3D high resolution seismic found 648 small faults in 2002 in order to quantificationally predict the remaining oil and finely adjust projects because oilfield has been entered into high water cut development period. This paper demonstrates the dependability of micro-small faults, which fault throw is about 5 m, and verifies that micro-small faults have effects on water injection development and casing damage for narrow and small sandstone oilfield.
The south of Putaohua oilfield lies in extention part of Putaohua structure toward the south, which is a third-level structure of the south of the secondary structural belt of Daqing placantieline of the central depression of Songliao basin. Drilling data verifies that there are 39 faults that all of them are normal faults, angle of them are 450°-50°. offset of them is over 10 m, and extention length of them is over 3 km. This oilfield has been developed since 1984 and the effect of oilfield development is good, which water cut is 73.51% and recovery percent of OOIP is 28. 1% at the end of 2002. Integrated researches of characteristic structure and micro-small fault interpretation by 3D high resolution seismic found 648 small faults in 2002 in order to quantificationally predict the remaining oil and finely adjust projects because oilfield has been entered into high water cut development period. This paper demonstrates the dependability of micro-small faults, which fault throw is about 5 m, and verifies that micro-small faults have effects on water injection development and casing damage for narrow and small sandstone oilfield.
引文
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