1、南華北盆地晚古生代以來構造沉積演化與天然氣形成條件研究        南華北盆地橫跨華北地塊、華北地塊南緣構造帶，同時緊鄰北秦嶺褶皺帶。其形成演化既受秦嶺大別造山帶的控制，又受到中國東部中新生代構造演化及郯廬斷裂系的影響。近年來，該區的油氣勘探陸續發現了一些源自上古生界的油氣顯示和小型煤成油藏，顯示了上古生界良好的勘探前景。因此，為了客觀地總結南華北盆地上古生界石油地質條件，本文將南華北盆地群作為一個整體，開展其晚古生代以來構造沉積演化與油氣地質條件研究，對于解決制約該區上古生界油氣勘探的幾個關鍵地質問題具有重要的

2、指導意義和參考價值。本文以板塊構造和大陸動力學理論為基礎，以含油氣盆地整體、動態、綜合分析為原則，通過野外地質調查與室內綜合研究相結合，主要開展了南華北盆地構造層序的劃分和重點勘探目的層系的多重地層劃分與對比，晚古生代以來各個時期的構造背景及其所控制的原型盆地類型及其演化特征，東秦嶺-大別山北緣逆沖推覆構造系統以及上古生界成藏系統基本要素與地質作用過程等諸方面的研究工作。主要成果和認識如下：將南華北盆地沉積蓋層劃分為六大構造層序。將研究區晚古生代以來盆地構造演化劃分為以下幾個階段：晚石炭世中二疊世弱伸展背景下的克拉通坳陷盆地形成階段；晚二疊世中三疊世安尼期內陸坳陷盆地形成階段；中三疊世拉丁期晚

3、三疊世末擠壓撓曲坳陷和背馱式斷陷盆地形成階段；早中侏羅世斷陷盆地形成階段；晚侏羅世早白堊世裂陷盆地形成階段；晚白堊世走滑拉分盆地形成階段；早第三紀斷陷盆地形成階段和晚第三紀第四紀弱伸展坳陷階段。東秦嶺-大別山北緣逆沖推覆構造在走向上具有分段性，傾向上具有分帶性。并經歷了5期逆沖推覆作用。其中，洛伊盆地、周口坳陷中北部凹陷主要分布于北支前鋒逆斷帶北側前淵地區，信陽合肥盆地等主要位于北支前鋒逆斷帶和南支逆斷帶之間的逆沖巖席及斷夾塊上。并指出印支-燕山期的南華北盆地并非前陸盆地性質，而是斷(裂)陷型盆地。在南華北盆地構造沉積演化分析的基礎上，對上古生界烴源巖條件和成藏條件進行了系統的分析，指出研究區

4、石炭二疊系是最有勘探前景的層系。油氣勘探應以找天然氣為主，以找油為輔。巖性或構造巖性圈閉為其主要勘探目標。上古生界成藏組合劃分為5種類型：源內自儲式砂巖型成藏組合，源內自儲式灰巖裂縫型成藏組合，近儲式下生上儲砂巖型成藏組合，近儲式上生下儲灰巖(白云巖)裂縫型成藏組合和跨越式下生上儲砂巖型成藏組合The Southern North-China Basin spans the North-China plate and the southern tectonic belt of North-China plate, meanwhile, it is adjacent to the North Q

5、inling orogen belt. Its formation and evolution is controlled by Qinling-Dabie orogen belt and affecting by the mid-Cenozoictectonic evolution of East China and the Tancheng-Lujiang fault zone. These years, Indication of oil and gas and small coal-formed oil reservoir which comes from Upper Paleozoi

6、c is founded gradually this area, which display good exploration prospect of Upper Paleozoic. Therefore, In order to evaluate condition of oil geology of Upper Paleozoic. The paper consider the Southern North-China Basins as a whole and study the Tectono-Sedimentary evolution since late palezonic an

7、d conditions of oil and gas and to solving some key geological issues related to hydrocarbon exploration in the region.The research base on the theories of plate tectonics and Continent geodynamics, use the method that petroliferous basin is analyzed integrally, dynamically and comprehensively, and

8、the investigation in the field was combined with research indoors, Studies are mainly on classifying tectonic-sequence and the multiple stratigraphic division and correlation of important exploration target in the Southern North-China Basin;confirming tectonic environment of every tectonic era and b

9、y its control of corresponding prototype basin;analysising the overthrust tectonic system in northern Qinling-Dabie orogenic belt and essential geological elements and various geological processes of Upper Paleozoic hydrocarbon accumulation system. Some conclusions are listed as follows:The platefor

10、m cover cap of the Southern North-China Basin can be divided into six tectonic sequences. The tectonic evolution of the Southern North-China Basin can be classified in eight stages: the intercratonic depression formation phase in the setting of weak-extensional (from Late Carboniferous to Mid Permia

11、n);the inland depressed basin formation phase(from Late Permian to the Anisian Middle Triassic);the intra-cratonic bending depression and piggyback basin formation phase(from the Ladinian Middle Triassic to Late Triassic); the rift-subsidence basin formation phase(Early-Middle Jurassic);the rifted b

12、asin formation phase(from Late Jurassic to Early Cretaceous); the strike-slip basin formation phase(Late Cretaceous); the rift-subsidence basin formation phase(Paleogene) and the depression basin formation phase(from Neogene to Quaternary).The overthrust tectonic system in northern Qinling-Dabie oro

13、genic belt in this area has the feather that it can be divided into subzones in the strike tendency and blocks in the dipping direction. which also can be divided into five episodes. LuoYi Basin and sags in the middle-northern of ZhouKou Depression were located in front of the North foremountain zon

14、e or foredeep zone,and XinYang-Heifei Basin were located on the median thrust sheet zone,which between the two thrust faults(NTH &STH).and point out that the Southern North-China Basin in Indosinian-Yanshanian is not foreland basin,but rift-subsidence basin.Based on the analysis of the tectonic-

15、sedimentary evolution in the Southern North-China Basin,conditions of source rocks in Upper Paleozoic and reservoir-forming have been carryied on in systematic. Indicate that the exploration should give priority to gas and oil is subordinate. Lithology or tectonic- lithology trap is main exploration aim. There are five patterns of fine play zone have been found out: self-generating and self-preserving sandstone in-source assemblages;self-generating and self-preserving fracture-type limestone in-source assemblages;down-generating and up-preservin