【作者】 张斌；

【导师】 唐书恒； 陈彦君；

【作者基本信息】 中国地质大学（北京） ， 地质工程， 2014， 硕士

【摘要】 沁水盆地南部煤层气地质条件好，具备煤层气勘探评价和开发的资源基础。为了理清沁水盆地南部郑庄区块煤层气富集规律，确定该区影响煤层气富集的主控因素，本文主要通过对郑庄区块基本地质概况的研究，从地质特征和煤储层物性特征两个方面重点归纳了影响煤层气富集的各种因素，即构造条件、煤层厚度、煤岩热演化程度、煤体结构、水文地质条件等地质因素，煤岩煤质特征、含气性特征、渗透性特征、煤岩力学性质等煤储层因素。在此基础上，优选出郑庄区块煤层气富集有利区，并对各富集区块的煤层气资源条件、构造条件、水文地质条件等进行分类描述，建立符合郑庄区块实际情况的煤层气有利区优选评价指标体系，应用灰色预测方法，优选出1-2个既满足煤层气地质富集成藏条件，又满足工程施工需要的煤层气富集高产有利区。经研究表明：沁水盆地郑庄区块总体为一NW方向倾斜的单斜构造，区内小断层较为发育，褶皱呈舒缓波状排列，总体构造较为简单；主要发育了三角洲平原亚相，其中以分流涧湾、分流河道、决口扇、泥炭沼泽、湖泊等微相为主，3号煤层顶板以泥岩为主，对煤层气保存有利，15号煤层顶板以巨厚层灰岩为主，对煤层气保存和开发不利；全区自上而下可划分出4个主要含水层，3号煤层顶板起到了较好的隔水作用；3号煤层横向分布稳定，总体上呈中北部厚南薄的变化趋势，有效厚度在2.40-7.35m之间，平均5.39m。埋藏深度呈北深南浅变化趋势，埋深在383.05-1336.9m之间，含气量在1.51-31.44m3/t之间，平均为19.93m3/t。采用注入/压降试井法，对郑庄区块的21口井进行了3号煤层原始渗透率测试，该井区煤层原始渗透率为0.011-1.9×10-3μm2，平均渗透率0.20×10-3μm2，属于低-中等渗透率。根据以上研究结果，制定了合理的优选原则，建立了符合郑庄区块实际情况的优选指标和评分标准，最终优选出了郑试45井-晋试10一线、郑试73井-郑试102井一线两个最有利目标区。更多还原

【Abstract】 The CBM geological condition of south Qinshui Basin is so good that has aresource foundation for CBM exploration and development. In order to ravel outCBM’s enrichment rule of Zhengzhuang block and confirm the main controllingfactor that influence CBM’s collection in this area, we sum the factors that influenceCBM’s enrichment from the two facts celled “macroscopic geological characterizesand microcosmic reservoir characterizes”, through the basic geologic researchingabout the Zhengzhuang block. The macroscopic geological characterizes include suchconditions as structural environment, coal thickness, thermal evolution, coal’sstructure, hydrogenologic conditions and so on. The microcosmic reservoircharacterizes include coal petrography and quality, gas content, permeabilitycharacterizes, mechanical property of the coal and so on. On that basis, we optimizedthe beneficial area of CBM from the Zhengzhuang block, given a classifieddescription to each block from resource condition, tectonic condition, hydrogenologiccondition and so on, established the CBM assessment system that accorded with thephysical truth of Zhengzhuang block. Finally, using the grey prediction method, weoptimized one or two beneficial areas of CBM that not only satisfies the geologicalconditions but also the engineer constructions’ requirement.Researches show that the Zhengzhuang block of Qin Shui Basin is a uniclinalstructure that inclines forward to the NW direction. In this area, the minor fault ismore common and the folds range as a relieve wave. Delta plain facies are the mainsedimentary facies in this area, among of them including some micro sedimentaryfacies such as diversion stream gulf, diversion stream river, flood fan, peat bog, lakeand so on. It is beneficial for the saving of CBM that the roof of3#coal seam is madeof mud stone. However, it is disadvantageous for the saving and developing of CBMthat the roof of15#coal seam is mainly made of thick marls. The whole regionconcludes four main aquifers and the roof of3#coal seam is a wonderful water proof.The transverse distribution of3#coal seam is stable with a generally trend that thenorth part is thick while the south part is thin. The effective thickness of3#coal seamis between2.40-7.35m and average5.39m. The depth of3#coal seam is between383.05-1336.9m with the trend that gradually becomes shallow from north to south.The gas content is between1.51-31.44m3/t and average19.93m3/t. Through theinjecting/pressure dropping well testing method, we tested the original permeability of3#coal seam in the twenty wells of Zhengzhuang block. The data shows that theoriginal permeability of3#coal seam is between0.011-1.9×10-3μm2and average0.20×10-3μm2, which is belong low-middle level. According to these research results,we formulated the reasonable optimizing principles and established the optimumindices and standard evaluations. In the end, we selected the area from ZS45well toJS10well and from ZS73well to ZS102well as the most favor target zone.更多还原