摘要
川西北九龙山地区三叠系飞仙关组二段在天然气勘探中取得重大突破,具有较大的勘探潜力。井下钻探资料显示飞仙关组二段(简称飞二段)发育多套储层且主要集中于飞二上亚段,整体非均质性较强,岩性、物性复杂多变,储层厚度较薄、钻井较少,难以明确鲕滩储层的空间展布特征,制约着该区天然气勘探进程。针对川西北九龙山地区飞二上亚段鲕滩储集层,利用井下储层特征及三维地震资料,分析鲕滩储层反射特征,再利用正演模拟,建立鲕滩储层地震响应模式,明确该区鲕滩储层地震响应特征为弱振幅—断续反射;通过采用层拉平印模法恢复飞二段古地貌,结合地震相分析及地震振幅属性特征,确定了鲕滩体发育有利相带分布特征。在有利相带分布的基础上,利用以相对阻抗为主的调谐振幅反演及波形差异反演方法对储集层空间展布进行精细预测,明确了储集层的空间展布特征,同时对鲕滩储层厚度及裂缝发育进行了预测,其储层厚度预测结果与实钻结果较为吻合,证实了该预测方法在该地区具有适用性,并根据裂缝发育、波阻抗值小于1.6×10^(6) g/(cm^(2)·s)、储层厚度大等指标进一步圈定鲕滩储层有利发育区,为下一步勘探开发提供有利依据。
The second member of Feixianguan Formation of Triassic in Jiulongshan area of northwestern Sichuan has made major breakthroughs in natural gas exploration and has great exploration potential.Drilling data show that the second member of Feixianguan Formation has developed multiple sets of reservoirs,which are mainly concentrated in the upper sub-member of second member of Feixianguan Formation.The overall heterogeneity is strong,the lithology and physical properties are complex and changeable,the reservoir thickness is thin,and drilling is less,so it is difficult to determine the spatial distribution characteristics of oolitic beach reservoir,which restricts the natural gas exploration process in this area.For oolitic beach reservoir in the upper submember of the second member of Feixianguan Formation of Jiulongshan area,using downhole reservoir characteristics and 3D seismic data,the reflection characteristics of oolitic beach reservoir are analyzed,and then the seismic response model of oolitic beach reservoir is established by forward modeling.It is clear that the seismic response characteristics of the reservoir in this area are weak amplitude-continuous reflection;through the use of layer flattening impression method to restore the ancient landscape of the second section of Feixianguan Formation,combined with seismic facies analysis and seismic amplitude attribute characteristics,the distribution characteristics of favorable facies belt for oolitic beach development are determined.On the basis of the distribution of favorable facies belt,this paper uses the relative impedance based on tuning amplitude inversion and waveform difference inversion method to make a fine prediction of the spatial distribution of the reservoir,defines the spatial distribution characteristics of the reservoir,and predicts the thickness and fracture development of oolitic beach reservoir.The prediction results of the reservoir thickness are in good agreement with the actual drilling results,which confirms the application of this pred
作者
周路
钱妤婕
吴勇
张连进
兰雪梅
王琦
钟高
ZHOU Lu;QIAN Yujie;WU Yong;ZHANG Lianjin;LAN Xuemei;WANG Qi;ZHONG Gao(School of Earth Science and Technology,Southwest Petroleum University,Chengdu 610500,China;Sichuan Provincial Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China;PetroChina Southwest Oil&Gasfield Company Exploration and Development Research Institute,Chengdu 610041,China;Southwest Branch,CNPC Logging Company Limited,Chongqing 400021,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2021年第10期1532-1545,共14页
Natural Gas Geoscience
基金
国家科技重大专项“典型盆地深层油气输导格架建立与油气成藏分析”(编号:2017ZX05008-004-008)资助.
关键词
鲕粒滩薄储层
古地貌恢复
有利相带
储层预测
飞二上亚段
九龙山地区
Oolite beach thin-bed reservoir
Paleogeomorphology restoration
Favorable facies belt
Reservoir prediction
The upper sub-member of second section of Feixianguan Formation
Jiulongshan area
