Heterogeneity Evaluation on the Hydrocarbon Generation and Expulsion from Fine Grained Sediment

Zhonghong Chen, Yuanshui Zhen, and Ming Zha
School of Geosciences, China University of Petroleum, Qingdao City, China

At present, the research on hydrocarbon generation and expulsion is often confined to limited samples from source rocks of tested geochemical information. This limited geochemical information, however, is unable to reflect the complex geological condition objectively for the complexity of hydrocarbon expulsion problem, and is very difficult to have a high resolution evaluation on the vertical continuous heterogeneous distributed source rocks effectively.

As the logging curve has characteristic of vertical high resolution, the total content of organic carbon (TOC) of source rocks can be calculated from the logging data. On the basic of TOC, some models were built combined with other geological and geochemical information to calculate the hydrocarbon generation and expulsion potential of every data point in the profile of hydrocarbon source rocks, thus realizing the high resolution study on the hydrocarbon generation and expulsion of source rock. This work is started with the relationship from measured geochemical information and logging information, to realize the transformation from logging information to residual organic carbon content, original organic carbon content, original hydrocarbon generation potential, original hydrocarbon expulsion potential and hydrocarbon expulsion efficiency (fig.1). Figure 2 shows the logging and geochemical indicators calculated by the method.

AAPG Datapages/Search and Discovery Article #90180©AAPG/SEPM/China University of Petroleum/PetroChina-RIPED Joint Research Conference, Beijing, China, September 23-28, 2013