准噶尔盆地春光区块古近系地层和岩性油气藏的形成与勘探

摘要

Many stratum and lithology oil and gas reservoirs have been found in Spring block palaeogene. Lithology oil and gas reservoir are mainly distributed on the edge of delta sedimentary lobe of braided river and the reservoir is the end deposits of underwater distributary channel. The stratum oil and gas reservoirs are mainly distributed on the unconformity surface of paleogene bottom and the reservoir is the sand body of water-in and water-out. Take analysis by combining the oil source, sedimentary reservoir, oil and gas transportation and construction condition and match the oil and gas charging times, and then we think that the exploration advantages and risk of palaeogene stratum and lithology oil and gas reservoir coexist. Although the stratum and lithology circle has a early development time and various types, in the context of spatial distribution, the thickness of sand body in reservoir is thinner, and the seismic data is limited so the exploration target is dififcult to carry out. In order to improve the success rate of exploration, the ifne sedimentary facies study of front delta phase change region, ifne carving and processing of sand body forms and high resolution treatment of seismic data are urgently needed.%春光区块古近系已发现多个地层和岩性油气藏。岩性油气藏主要分布在辫状河三角洲沉积朵体边缘，储集层为水下分流河道末端沉积；地层油气藏主要分布在古近系底部不整合面之上，储集层为水进水退砂体。结合油源、沉积储层、油气输导和构造条件分析，匹配于油气充注期次，认为研究区古近系地层和岩性油气藏勘探优势与风险并存。虽然地层和岩性圈闭发育时间早，类型多，但在缓坡沉积背景下，储集层砂体厚度较薄，且地震资料有限，勘探目标落实难度较大。为提高其勘探成功率，三角洲前缘相变区的精细沉积相研究、砂体形态的精细雕刻与高精度地震资料的处理都亟需进行。