DISTRIBUTION AND ORGANIC GEOCHEMICAL CHARACTERISTICS OF HYDROCARBON SOURCE ROCKS IN THE JIAOLAI BASIN

Based on the data of field outcrops and wells in the Jiaolai Basin,the authors believed that the dark mudshales mainly developed in Shuinan Member of Laiyang Formation.Distribution characteristics of the dark mudshales in Jiaolai Basin were analyzed on the basis of measuration and exploration of field sections,combining with the seismic data and the study on sedimentary facies and paleocurrent orientations.Moreover,the abundance,types and maturity of the organic matters from the dark mudshales in Shuinan Member of Laiyang Formation,which are in different tectonic units of Jiaolai Basin,such as Laiyang Sag,Pingdu-Xiagezhuang Sag,Gaomi-Zhucheng Sag,were studied by means of several analysis methods.Study results show that hydrocarbon source rocks in Jiaolai Basin mainly developed in Laiyang Sag and Pingdu-Xiagezhuang Sag.The abundance of organic matter is higher and can come up to the standard of fairly good hydrocarbon source rocks or good hydrocarbon source rocks.Most of the organic matters are type Ⅰ to Ⅱ₁.The organic matter is in the evolution stage of maturation.So,the Laiyang Sag and Pingdu-Xiagezhuang Sag are the favorable exploration areas in the Jiaolai Basin.