松辽盆地西部张裂缝预测的应力场方法

以松辽盆地地质资料为基础，介绍了应力场和张裂缝预测的计算方法。通过了各种岩性的张破裂概率隶属函数，预测松辽盆地西部张裂缝区的分布。据此，为今后的油气勘探提出了几点认识和建议。     

CALCAREOUS CONCRETIONS IN THE NORTHERN EAST CHINA SEA

The article makes a research of the calcareous concretions in the surface sediments of the northern East China Sea. Based on the isotopic composition of carbon and oxygen, chemical composition, radiometric dating and distribution pattern of the concretions, we infer that they are chiefly formed in the area of the fossil delta of the Changjiang River under a fresh water environment. Therefore, the calcareous concretion can act as a facies indicator, showing that the sea bottom of the area once exposed above the sea water.     

东海北部的钙质结核

本文对东海北部表层沉积物中由成岩方解石和陆源碎屑组成的钙质结核进行了研究。根据结核的碳氧同位素成分、化学成分、测年资料及分布格局,推断本区钙质结核主要形成在古长江三角洲区,是淡水环境下的产物。因此,钙质结核可以作为一种指相标志,表明该区海底曾经出露水面。