New insights and exploration practices of coal-bearing source rocks in the Huibei area,Pearl River Mouth basin
The exploration potential of the coal-bearing source rocks of the Enping Formation,located within Pearl River Mouth basin,has been overlooked due to a deficient comprehension of the main controlling factors in their distribution and the undefined scale of their development.Focusing on the developed coal-bearing source rocks in the Huibei area as a case study,this research utilized seismic,drilling,and geochemical data to systematically analyze the controlling factors influencing the distribution of these source rocks.Consequently,the development scale and resource potential of the coal-bearing source rocks were determined to guide exploration endeavors effectively.The study revealed that,①Vertically,during the depositional periods from the fourth Member to the first and second Members of the Enping Formation,the Huibei area experienced a warm and humid paleoclimate with progressively shallower paleo-water depths and decreasing paleo-tectonic activity intensity.The first,second,and third Members of the Enping Formation carry favorable conditions for the development and accumulation of coal beds,while the fourth Member exhibited very limited coal formation.②Horizontally,controlled by paleo-depositional environments,coal-bearing source rocks are primarily distributed in the inter-channel overbank swamps of braided river deltas within the northern gentle slope belt and in the lacustrine swamps within the shore-shallow lake areas of the Huibei depression.Based on the distribution law of coal-bearing source rocks,a resource volume of approximately 200 million cubic meters of oil equivalent in the Huibei area was estimated.This not only invigorated exploration in the adjacent regions of the Huibei area but also demonstrated the prospect of the exploration for favorable hydrocarbon-generating depressions with developed coal-bearing source rocks in the Pearl River Mouth basin.
万方数据
维普
