Dissertation
Dissertation > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas

A Study on the Genesis and Evaluation of Tight Sand Reservoir in Daniudi Gasfield

Author WangGuangQiang
Tutor QiuLongWei
School China University of Petroleum
Course Geology
Keywords Ordos Basin Daniudi gas field Diagenesis Controlling factors Reservoir Evaluation
CLC P618.13
Type Master's thesis
Year 2010
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The Ordos Basin Daniudi gas field development characteristics of the reservoir lack of understanding of the system . Papers to the modern theory of sedimentology and reservoir geology theory as a guide , the integrated use of the core , logging , logging , production testing and analysis laboratory , Carboniferous - Permian reservoir characteristics and effective reservoir control factors and reservoir evaluation , a comprehensive and systematic study . The work area deposition Background braided river delta sedimentary microfacies of braided river delta plain and braided river delta front deposition . The study suggests that reservoir types of clastic rocks , including conglomerate , conglomerate and sandstone , showed a higher element of maturity and lower structural maturity . Reservoir diagenetic stage can be divided into early diagenetic stage B , the middle diagenetic A1 , the subperiod A2 and diagenetic B period , mainly developed compaction , cementation and metasomatism authigenic clay mineral cementation , dissolution and other diagenetic events . The reservoir space by cause divided into primary porosity , secondary porosity and cracks , which mainly secondary porosity . With increasing depth , reduced primary porosity , secondary porosity and cracks , vertical on the major development of two secondary pore zone . The one hand , the micro- cracks in the sandstone pore connectivity , sandstone reservoir performance , on the other hand acts as the output of fluid migration catheter . Carboniferous - Permian reservoir pore structure in the holes - micro throat , is a low permeability reservoir . Macro of reservoir properties controlled by tectonism ; vertical , mainly influenced by diagenesis ; plane , mainly influenced by deposition . Compaction and the denser matrix contents reservoir rock , reservoir quality is poor , on the contrary , good reservoir properties . The the reservoir evaluation classification criteria and study area reservoirs whole divided into four categories on the basis of the main controlling factors of reservoir properties Ⅰ and Class Ⅱ reservoirs effective reservoir . The results show that the favorable reservoir more than concentrated in the central and southwest areas of the work area , depositional environment braided river delta front , the main types of sand bodies underwater distributary channel sand body , rock type multi- to coarse-grained to grain quartz sandstone , lithic quartz sandstone .

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