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三、本区碳酸盐岩的分布规律及其与隐蔽油气藏的关系本区中部组合以生物灰岩为主的淡水碳酸盐岩,主要是以多层透镜体状赋存于砂泥岩地层中,共累计厚度占总厚度的10％左右。如塔6井青二、三段地层,总厚196米,夹有碳酸盐岩58层(共中≤0.4米的占81％,>2米的占1.7％),累计厚度18米,占地层总厚度的9.18％。从纵向分布上看,碳酸盐岩主要发育于湖水广阔时期(如青山口组时期、姚家组末期和嫩一段时期)。因此时浅湖广布、水质清澈,适于生物生长,所以生物灰岩此较发育;反之,在湖水收缩期,由于气候干燥,泥砂大量注入湖中,所以生物灰岩不发育。在不同沉积相层段中,共分布状况不同。在浅湖沉积中,灰岩多发育于反向小旋回的上部;在较深湖沉积中,灰岩多夹在黑色泥岩中;而在河流沉积区,则无灰岩发育。
DISTRIBUTION OF CARBONATE ROCKS IN THE SOCIETY AND RELATIONSHIP WITH SUBMERGED HYDROCARBONES Freshwater carbonate rocks, mainly composed of bio-limestone, are integrated in the middle part of the area mainly in the form of multilevel lenticulars that occur in sand-shale formations In total, the total thickness of the total thickness of about 10%. For example, the well of Pagoda 6 has a total thickness of 196 meters with 58 layers of carbonate rocks (81% in total ≤ 0.4 meters and 1.7%> 2 meters) with a total thickness of 18 meters, accounting for The total formation thickness of 9.18%. From the vertical distribution point of view, carbonate rocks mainly develop in the vast lake period (such as the Qingshankou Formation, the late Yaojia Formation and a tender period). Therefore, when the shallow shallow lake, water quality, clear, suitable for biological growth, biological limestone this more developed; the other hand, in the systolic lake, due to dry climate, large amounts of sediment into the lake, so the biological limestone is not developed. In different sedimentary facies, the distribution is different. In the shallow lake sediments, limestone mostly develops in the upper part of reverse small cycles. In deeper lake sediments, limestone is often sandwiched in black mudstone, while in river sedimentary areas, there is no limestone.