胶莱盆地水南组页岩气成藏条件与勘探方向

Shale gas pooling conditions and exploration targets of Shuinan Formation in Jiaolai Basin

刘鹏 2 朱炎铭 2 王怀勐³ 王毅 2 谢康珍 2

1．中国矿业大学资源与地球科学学院，江苏 徐州 221116 2．中国矿业大学煤层气资源与成藏过程教育部重点实验室，江苏 徐州 221116
3．山东泰山地质勘查公司，山东 泰安 271000

School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China MOE Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221116, China Taishan Geological Survey Company, Tai′an 271000, China

胶莱盆地是中国东部典型的中生代断陷盆地，陆相湖盆背景下沉积的水南组发育较厚的富有机质泥页岩，是页岩气成藏的有利区，分析其成藏条件对于明确该区页岩气下一步勘探方向具有重要意义。鉴于此，文中依据页岩气成藏的重要参数，以野外调查资料为基础，结合室内多种测试手段，从沉积环境、泥页岩分布、有机质丰度及类型、有机质成熟度、孔裂隙特征、矿物组分以及含气性等7个方面与鄂尔多斯盆地延长组7段泥页岩进行页岩气成藏地质条件对比，并采用综合信息叠加法进行勘探目标区预测。结果表明，研究区莱阳凹陷西南部、夏格庄洼陷中部和诸城凹陷北部具备页岩气富集成藏的条件，可作为下一步页岩气有利勘探目标。

Jiaolai Basin is typical of the Mesozoic fault basin in eastern China, where a set of thick black shale is developed in Shuinan formation and favorable conditions exist for shale gas accumulation. It is very important to analyze its shale gas accumulation conditions and recognize future exploration targets. According to the types of shale gas reservoirs and gas pooling elements, combining the field survey data with indoor variety of testing methods, this paper analyzes various conditions, such as the sedimentary environment, shale distribution, abundance and type of organic matter, organic matter maturity, holes and cracks, mineral components, adsorption isotherm, as well as gas content. Favorable areas are forcasted by comparing the geological characteristics with the Chang 7 layer′s shale and using overlapping of available data, the conclusion is that the study area southwest of Laiyang Depression, Xiagezhuang Sag and Zhucheng Depression can be selected as the next exploration targets.

10.6056/dkyqt201601001