| Comprehensive analysised the stratigraphical and structural and sedimentology and reservoir in chang8and chang9reservoir of the study area, the structure of the study area is very simple, nose structure developed in local area in the gentle western-lean ing single inclined, chang8and chang9reservoir belongs to the delta front deposition, underwater distributary channel developed.Used the analysis and test data to research the features of physical properties and lithology and pore structure in chang9reservoir of the study area, the study area is poor reservoir, main porosity is4%-12%, and the average is6.84%, mainly permeability is O.100mD～10.000mD, an average is1.590mD, belongs to low permeability and low porosity reservoirs, lithology is mainly arkose, a few of lithical arkose.Reservoir density is mainly affected by the strong compaction effect and the influence of the cementation, the two kinds of diagenesis makes porosity lost more than70%, Cementing the muddy thing is good to form zeolite secondary solution pores, reservoir physical properties have improved. The distribution of high quality reservoirs in the study area is controlled by the thinkness of the sand and cementation,the main control factor is the content of the content of cement, the higher the laumontite content, the better the reservoir is, high quality reservoirs mainly distributed in the place where the sand and laumontite are both good. The oil reservoir of study area enriched the sand that who is in the middle of lijiapan shale in the top of chang9reservoir, the shale is both hydrocarbon source rocks and cover layer, comprehensive analysised the sand body and the sedimentary facies and sandstone components and pore structure and the reservoir physical properties of the influence of the oil distribution and concluded that:the distribution of the chang9oil reservoir mainly controlled by the reservoir physical property. |
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