基于分形理论的杨梅树向斜构造复杂程度研究
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摘要
为了从构造角度为川滇黔盆地六盘水断陷杨梅树向斜煤层气勘探开发提供地质依据,以区内52号煤为研究对象,分析了断裂和构造曲率区域分布特征,并进行构造区划分,以期实现对煤层气构造有利区的判别。研究结果表明:①杨梅树向斜的相似维介于0～1.39,可划分为断裂简单区域、断裂中等复杂区域和断裂复杂区域,区内以断裂简单区域为主,中等复杂区域主要分布于中部呈NW-SE向条带状,复杂区域分布范围较小;②构造曲率介于(-82.18～17.61)×10~(-5),可划分为低曲率区、中曲率区和高曲率区,区内主要存在两个构造曲率极值带,位于妥倮向斜附近,马龙向斜周边区域构造曲率值也相对较高;③综合考虑5_2号煤断层分维值及构造曲率,将杨梅树向斜划分为构造简单区、中等复杂区和复杂区,区内主要以构造简单区和中等复杂区为主,两者分布范围大致相同,从西南至东北方向呈相间分布的趋势,构造复杂区分布范围小。结论认为,从构造复杂程度角度分析,杨梅树向斜大部分地区均有利于煤层气的开发。
In order to provide the geological basis for the CBM exploration and development in Yangmeishu syncline from the viewpoint of structure, No.52 coal in this area was taken as the research object in this paper. The regional distribution characteristics of its faults and structure curvatures were analyzed and the structural regions were divided so as to identify the favorable CBM structural zones. And the following research results were obtained. First, the similar dimension(Ds) of Yangmeishu syncline is in the range of 0-1.39 and it can be divided into simple fault zone, moderate-complexity fault zone and complex fault zone. In this area, simple fault zones are dominant, moderate-complexity fault zones are mainly distributed in the form of NW-SE strip in the central area and complex fault zones are distributed in a smaller area. Second, the structural curvature ranges(-82.18～17.61)×10~(-5), and it can be divided into low curvature zone, moderate curvature zone and high curvature zone. In this area, there are mainly two structural curvature extreme zones, which are located near Tuoluo syncline. The structural curvature in the periphery of Malong syncline is also higher.Third, considering the fault fractal dimension and structural curvature of No.52 coal comprehensively, Yangmeishu syncline is divided into simple structural region, moderate-complexity structural region and complex structural region. This area is dominated by simple structural regions and moderate-complexity structural regions,which are approximately the same in the distribution range, presenting the trend of alternating distribution from the southwest to the northeast. And the distribution range of complex structural regions is small. In conclusion, from the viewpoint of structural complexity, Yangmeishu syncline is mostly favorable for CBM development.
In order to provide the geological basis for the CBM exploration and development in Yangmeishu syncline from the viewpoint of structure, No.52 coal in this area was taken as the research object in this paper. The regional distribution characteristics of its faults and structure curvatures were analyzed and the structural regions were divided so as to identify the favorable CBM structural zones. And the following research results were obtained. First, the similar dimension(Ds) of Yangmeishu syncline is in the range of 0-1.39 and it can be divided into simple fault zone, moderate-complexity fault zone and complex fault zone. In this area, simple fault zones are dominant, moderate-complexity fault zones are mainly distributed in the form of NW-SE strip in the central area and complex fault zones are distributed in a smaller area. Second, the structural curvature ranges(-82.18～17.61)×10~(-5), and it can be divided into low curvature zone, moderate curvature zone and high curvature zone. In this area, there are mainly two structural curvature extreme zones, which are located near Tuoluo syncline. The structural curvature in the periphery of Malong syncline is also higher.Third, considering the fault fractal dimension and structural curvature of No.52 coal comprehensively, Yangmeishu syncline is divided into simple structural region, moderate-complexity structural region and complex structural region. This area is dominated by simple structural regions and moderate-complexity structural regions,which are approximately the same in the distribution range, presenting the trend of alternating distribution from the southwest to the northeast. And the distribution range of complex structural regions is small. In conclusion, from the viewpoint of structural complexity, Yangmeishu syncline is mostly favorable for CBM development.
引文
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[2]李明,姜波,林寿发,等.黔西发耳矿区构造演化及煤层变形响应[J].煤炭学报,2011,36(10):1 668-1 673.
[3]刘大锰,李俊乾.我国煤层气分布赋存主控地质因素与富集模式[J].煤炭科学技术,2014,42(6):19-24.
[4]徐猛.沁西北X区块煤层气富集高产主控因素分析[J].天然气技术与经济,2018,12(2):28-30.
[5]刘令生.基于分形理论的矿区构造定量分析及评价[J].华中科技学院学报,2018,15(3):1-9.
[6]刘玉林.分形理论在霍林河煤田构造复杂程度评价中的应用[J].煤炭技术,2004,23(11):91-93.
[7]汪宏志,孙林,胥翔,等.基于分形理论的芦岭煤矿8煤层顶板断裂构造复杂程度研究[J].中国煤炭地质,2012,24(6):22-25.
[8]刘刚,朱炎铭,侯晓伟,等.开平煤田构造曲率与煤层气赋存特征[J].煤炭技术,2015,34(11):123-125.
[9]秦勇,姜波,王继尧,等.沁水盆地煤层气构造动力条件耦合控藏效应[J].地质学报,2015,34(11):123-125.