Abstract: In-Situ Stress Investigation of Jingqiu Oil Field Sand Section No. 2 Oil-Bottom
Structure
LIAN, ZHANGHUA, Southwest Petroleum Inst.
JingQiu oilfield located at Chulu county, Heibei, in P. R. Of China, the JingQiu
oilfield sand section No.2 oil-bottom
structure (JQSS) is 3080 meters deep. The drape area
is 2.48 square kilometers, including 6 faultages. Oil source bed mainly distributed
2900~3300 meters deep, the terrane obliquity angle is 50~80 degree. The paper established
the finite element mechanical model of JingQiu Oil Field Sand Section No.2 Oil-
bottom
Structure. The in-situ stresses were found with fault displacement, fault obliquity and
separation. Cap mathematical model was used to rock properties, based on the
elasto-plastic FEM theory, the in-situ stress distribution of the research region was
obtained by the analysis software ANSYS. The tension stress regions were divided in terms
of the magnitude of principal stresses, the regions may produce some tensile fractures,
and form fracture developed zone, it has guidance meaning to find the fracturing developed
zone and determine the well position. The paper describes and analyzes the results
obtained
AAPG Search and Discovery Article #90911©2000 AAPG Pacific Section and Western Region Society of Petroleum Engineers, Long Beach, California