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近年来,山东济阳坳陷下古生界的风化淋滤带,钻探到洞穴堆积型高产储集岩,以孤北10井的最典型。洞穴堆积物形成于侏罗纪,成洞基岩为中奥陶统马家沟组碳酸盐岩,洞高10.08m,洞穴堆积厚8.28m,未被充填的洞穴空间1.8m。洞穴堆积物杂乱无序,由三类组分构成:(1)成洞基岩崩塌物,(2)洞穴化学沉积的破坏产物,(3)成洞期或成洞期后的外来物质。洞穴堆积物由于得到洞壁的保护而免受正常压实,保存了大量的孔隙,因而愈是细粒的堆积物原始孔隙愈高,洞穴泥岩的孔隙度最高可达37.9%。济阳坳陷洞穴堆积深埋后,受到酸性水溶液的的溶蚀,增加扩大了孔隙和溶蚀通道,成为良好的高产储集岩。
In recent years, the lower Paleozoic weathering leaching zone in the Jiyang depression of Shandong Province has been drilled to cavernous accumulation-type high-yielding reservoir rock, with the most typical Gubei-10 well. The cave deposits formed in the Jurassic. The bedrock-forming bedrocks are carbonate rocks of the Middle Ordovician Majiagou Formation with a cave height of 10.08m, a cavern accumulation of 8.28m and an unfilled cave space of 1.8m. The cave deposits are chaotic and consist of three components: (1) cave-in bedrock collapses, (2) cave-in chemical deposits, and (3) foreign matter after the hole or tunneling. Cave deposits are protected from normal compaction due to the protection of the cave walls and preserve a large number of pores. As a result, the higher the original porosity of the more finely packed deposits, the highest porosity of cave mudstone can reach 37.9%. After deep burial in Jiyang Depression, the caves in the Jiyang Depression are eroded by acidic aqueous solution, which increases the porosity and dissolution channels and becomes a good high-yield reservoir rock.