Source rock characteristics and potential plays of marine sequences in North and Northeast China
Source rock characteristics and potential plays of marine sequences in North and Northeast China
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作者：
Sinopec Exploration
根据野外露头观察和岩心分析，对冀北方中、上元古界优质烃源岩的分布进行了初步研究。冀北方中、上元古界优质烃源岩主要分布在红绥庄组下部华北北方缘下寒武统优质烃源岩主要分布在新集组底部（或雨花台组）;鄂尔多斯盆地西南缘中奥陶统优质烃源岩主要分布在平凉组下部，均以黑色泥岩为主，认为华北地台内部奥陶系马家沟组碳酸盐岩总体上是较差的烃源岩，华北南部比鄂尔多斯盆地和渤海湾盆地更适合石炭-二叠系煤成烃源岩的发育，由于前者有含煤的上、下石盒子组，而后者没有含煤的上、下石盒子组，考虑到变质作用，通过对东北地区上古生界烃源岩的研究，认为未变质的烃源岩主要分布于中、新生代，认为鄂尔多斯盆地西南缘是常规油气勘探的有利地区，华北南部是上古生界煤成油气勘探的有利地区，而二连盆地中西部和松辽盆地东南部是煤成油气勘探的有利地区。（3）冀北方中、上元古界和东北地区上古生界是值得进一步研究和勘探的前沿领域。
Based on outcrop observations and core sample analysis,we make a preliminary study of the distribution of quality source rocks in the Middle and Upper Proterozoic in northern Hebei province,the Lower Cambrian in the sorthern margin of North China and the Middle Ordovician in southwestern margin of Ordos Basin.Quality source rocks in the Middle and Upper Proterozoic in northern Hebei province are mainly distributed in the lower part of the Hongsuizhuang Formation in the Mesoproterozoic Jixian System;quality source rocks in the Lower Cambrian in the northern margin of North China are mainly distributed in the base of the Xinji Formation(or the Yuhuatai Formation);quality source rocks in the Middle Ordovician in southwestern margin of Ordos Basin are mainly distributed in the lower part of the Pingliang Formation.They are all dominated by black mudstone/shale.We think that carbonates in the Ordovician Majiagou Formation in intra North China platform is poor source rocks as a whole.The southern part of North China is better for the development of coal-related source rocks in the Permo-Carboniferous than Ordos Basin and Bohai Bay Basin,since the former has the coal-bearing Upper and Lower Shihezi formations but the latter ones do not have.Considering of metamorphism,we examine the Upper Paleozoic in Northeast China and conclude that source rocks without metamorphism are mainly distri-buted in the middle and western parts of Erlian Basin and the southeastern part of the Songliao Basin.In conclusion,we think that 1)southwestern margin of Ordos Basin is favorable to explore conventional oil/gas;2)sou-thern part of North China is favorable to discover coal-derived oil/gas in the Upper Paleozoic;3)the Middle and Upper Proterozoic in northern Hebei province and the Upper Paleozoic in Northeast China are frontiers that are worthy of further research and exploration.