Deformation Mechanisms Of Salt Rock And Its Effect On Fault Seal In Dongying Sag

There is a series of achievements about salt tectonics both at home and abroad.This paper points out that fluid in the tectonics development of the important role of salt,which is based on previous studies and the developmental characteristics of salt t ectonics in Dongying sag.It contains a lot of salt-gypsum and salt-gypsum formations.This paper analyzes the characteristic of the salt tectonics according to core,logging and seismic data.Abnormal high pressure created by salt-gypsum dehydration in stratu m,high pressure can be used as a dynamic force fluid flow upward and this contribu tes to hydraulic fracturing in the overlying strata and can drive the salts material in t he process of fluid upwelling upward movement.This paper proposes that salt-gypsum dehydration has an important influence on the formation of the salt tectonics.Based on the effect of salt-gypsum dehydration and overpressure fluid,the history of model of member 4 of Shahejie Formation salt diapir in Dongying sag is established accordi ng to seismic cross-section and logging data.Salt tectonics are analyzed during the mi gration of fluids in the process of development,salt-gypsum dehydration effect in earl y and mid-salt tectonic development important role.Combined with previous experiments on single isometric rock salt creep and creep experiments that third-axis,mudstone sandwich,cream and salt water has a significant impact on the salt rock deformation.Dongfeng 3wells,Dongfeng 5 wells,Hake 1 wells,deep wells and abundance,for example,a combination of macro and micro analysis of the distribution of the different rock salt wells at the east three existing wells are mostly rock salt,high purity,cream containing less salt and shale may be due in geological history,due to the effect of gravity slip so heavy cream salt and other substances to the wings deposition.5 well is located in the east flanks of salt structures containing cream salt,mud and other more uplifting in the handling process,the height of the paste of salt and other substances lead to downward flow due to gravity height thick halite rock salt at low thin.Haoke 1 well has been able to retain the three gypsum rock,I think that with the development of the central uplift intricate faults,most of the big four in the sand above the main fault,only a small portion of the fault through the sand sections,which is good for protect the salt rock Haoke 1 well area.Dongfeng well and Haoke 1 well at the same central uplift belt,but the area is located east wells penetrate several major fault,which is one of the causes of Dongfeng Dongfeng 3 Salt rock is thinner than Dongfeng 5.Feng deep two just in the lower salt structure,a lot of rock salt,gypsum and salt and mud and other substances are gathered here,so the abundance of two deep wells out of rock salt thickest,also contains three gypsum rock.Dongying depression,rock salt were observed in the sample fluid inclusions,depending on the size and shape,can be divided into three categories: first negative crystalline inclusions,the volume is very large,and often contain inclusions in minerals child,since the mineral composition of gypsum paste salts,such inclusions due to the volume is too large,the production process or the heating process vulnerable to damage,when measured temperature homogeneity found homogenization temperature higher than the same period the number of such parcels homogeneous body temperature is not used;inclusions recrystallized second category is formed,the volume is relatively small,the particle distribution of marginal groups,such inclusions when the measured temperature uniformity,inclusion of bubbles disappear earlier time consistent,uniform temperature can be used for reference;the third category is irregular inclusions were observed by my guess is after the formation of such inclusions in halite recrystallization late due by force to deform,such packages Few body gas-liquid two-phase.Salt rock and gypsum rock increases with depth,with a strong plastic,easy flow characteristics of oil and gas under salt have a good blocking effect,use form good reservoir;tectonic activity on rock salt and cream of rock salt less damaging effects on the reservoir has a good protective effect,of course,in a seismically active area,the tectonic stress strong through the rock salt will form a salt structure,if the reservoir had been formed,it certainly will cause oil and gas leak,If you had no reservoir,so as a result of dehydration of gypsum and salt,rock salt water particles have recrystallization,broken rock salt particles after recrystallization,still has a good shot-blocker;salt rock salt layers and the lower part of the fluid can be sealed blocking,conducive to the formation of abnormal high pressure hydrocarbon accumulation.