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一、煤系地层沉积条件分析加福煤田位于福建省东部,构造位置属华南加里东褶皱系华夏褶皱带梅永拗陷北部。煤田二迭纪煤系地层,成生于加里东运动期后形成的拗陷区内,其沉积方向大致沿北东-南西向延展。它的形成是在下二迭统栖霞组与下三迭统溪口组两次海侵中间的海退阶段。在此近海型成煤环境中,沉积了以泻湖相为主的含煤旋回-下二迭统加福组(P_1j)及以冲积-湖泊相为主的含煤旋回-上二迭统翠屏山组(P_2cp)。煤系沉积厚度达1250米,含煤80余层(图1)。
Analysis of sedimentary conditions of coal-bearing strata The Jiafu coalfield is located in the east of Fujian Province and is located in the north of the Meiyu depression in the Huaxia fold belt of the southern China Caledonian fold. The Permian coal-bearing strata in the coalfield formed into a depression area formed after the Caledonian movement. Its sedimentary direction extends generally north-southwestward. Its formation is in the second Permian Qixia Formation and the Lower Triassic Xikou Formation two transgressions of the middle of the regression stage. In this offshore coal-forming environment, the lacustrine facies-dominated coal-bearing Cyclone-Lower Permian Jiafu Formation (P_1j) and the alluvial-lacustrine coal-bearing Gyrus-Upper Permian Cuiping mountain formation (P_2cp). Coal-bearing sedimentary thickness of 1250 meters, more than 80 layers of coal (Figure 1).