摘要：The ultra-deep fracture-vuggy carbonate reservoirs are well developed in the Halahatang area of the Tarim Basin.In the process of drilling and completion,the reservoir will often be damaged due to various reasons,which will affect the subsequent production stage.Understanding the damage mechanism of the Ordovician carbonate reservoir in the Halahatang Oilfield in the Tarim Basin can help to provide suggestions for the driiling and completion,reducing the formation damage.In this regard,this article first analyzes the physical properties of the reservoir and understands the potential reservoir damage factors,and then discusses the damage mechanism of the reservoir in detail.The experimental results show that the main storage space of this reservoir is pores such as intragranular pores,mold pores,dissolution pores,etc.,and the main seepage channels are cracks-microcracks connecting the pores.The reservoir formation contains a large amount of calcite and basically does not contain dolomite,showing strong homogeneity.The reservoir has moderate to weak velocity sensitivity damage.The velocity sensitivity damage rate is about 30%,and the damage degree is moderate to weak.The hydrochloric acid and soil acid sensitivity damage rate of reservoir is greater than 50%,and the damage degree is medium to strong.The stress sensitivity damage rate is medium to strong (50%-70%) for reservoir matrix cores and very strong for artificial fractured cores (greater than 80%).In addition,the reservoir has strong water lock damage.
