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在一个含油气盆地内,随着勘探程度的提高,深层作为新的油气勘探领域越来越引起人们的关注。深层碎屑岩储层储集空间类型以次生溶蚀孔为主,被溶解物质往往是碎屑岩原始沉积的骨架颗粒和早期化学胶结物。塔里木三叠系砂(砾)岩以岩屑砂岩为主,其中碳酸盐胶结物含量为5～35%;冀中下第三系砂岩以长石砂岩为主,并含有丰富的碳酸盐胶结物(3～35%);这些物质为晚期溶解形成次生溶蚀孔隙提供了丰富的物质基础。冀中下第三系深层碎屑岩当埋深大于3500m时,实测岩心孔隙度最大值小于20%;渗透率最大值小于100×10~(-3)μm~2;大多数砂层的孔隙度小于10%;渗透率小于10×10~(-3)μm~2;单井日产液量不足100吨。而塔里木盆地三叠系碎屑岩储层,在埋深5000m时仍具有孔隙度最高值大于20%、渗透率最高值大于1000×10~(-3)μm~2的储集条件;单井产油量达到日喷油大于500吨,天然气大于1万立方米。本文通过对这两个地区深层碎屑岩储集条件分析认为两地古今地温场的差异是影响深部碎屑岩成岩作用的主要因素;多套烃源岩层系热演化时间跨度的差异直接影响了深部储层储集能力。
In a petroliferous basin, as the level of exploration increases, deep as a new field of oil and gas exploration more and more cause for concern. The type of reservoir space for deep clastic rock reservoirs is dominated by secondary dissolution pores, and the dissolved matter is often the original sedimentary framework particles and early chemical cements of clastic rocks. Tarim Triassic sand (gravel) rocks are mainly composed of lithic sandstones, with carbonate cement content of 5 ~ 35%. The middle and lower Tertiary sandstones of Jizhong are dominated by feldspathic sandstones and are rich in carbonate (3 ~ 35%). These materials provide a rich material foundation for late dissolution and formation of secondary dissolution pores. When the buried depth is more than 3500m, the maximum measured core porosity is less than 20%; the maximum permeability is less than 100 × 10 ~ (-3) μm ~ 2; and the porosity of most sand layers Degree less than 10%; permeability less than 10 × 10 ~ (-3) μm ~ 2; single well Nissan liquid volume less than 100 tons. The Triassic clastic reservoirs in Tarim Basin still have the highest porosity of more than 20% and the highest permeability of more than 1000 × 10 -3 m 2 at the depth of 5000 m. Oil production reached more than 500 tons of fuel injection, natural gas is greater than 10,000 cubic meters. Based on the analysis of the reservoir conditions of deep clastic rocks in these two areas, the paper considers that the difference of the geothermal field between the two places is the main factor affecting the diagenesis of deep clastic rocks. The difference of the time span of thermal evolution of multiple sets of source rocks directly affects Deep reservoir capacity.