Research Of Deep Fluid Recognition And Reserve Evaluation In Changshen-1 Block

This paper, based on the previous work, synthetically using the existing material of drilling,logging,testing and analysis tests, conducts a series work aiming mainly at deep fluid recognition and reserve evaluation of the southern Songliao basin: It describes the fine geologic research for research area reservoir, analyses the content about structural feature,formation characteristics,gas reservoir types,reservoiring mechanism,fluid property and the reservoir reasonable productivity; Using combining well logging with gas logging, it establishes a set of fluid identification standards which is suitable for JiLin oilfield deep volcanic rocks and clastic reservoirs, from the seven aspects(high-resolution array side, MDT tests and LFA fluid identification, NMR point measurement method, neutron and density curve intersection method, interval transit time and neutron porosity overlap, vertical and horizontal wave overlap, using of gas logging and geochemical logging results), it develops fluid identification for deep volcanic rocks and clastic reservoir, and applies to actual production; On the basis of investigating various calculation method of geological reserves, it makes sure of the fine calculation method of geological reserves, counts,analysis,calculates the basic parameters and distribution characteristics of various reserves calculation, and partitions calculating unit, combines with the dynamic characteristics of reservoir. At the same time, it evaluates separately for geological reserves,technical recoverable reserves,economic recoverable reserves and secondary economic recoverable reserves, it also analysis reserves calculation result and reliability.Mainly achieve the following conclusions:1.Changshen-1 gas field mainly develops two types of rocks: clastic rocks and volcanic rocks. Clastic rocks are mainly the reservoir for fluvial reservoir, their lithology are fine sandstone and glutenite reservoirs, reservoir properties are influenced by the depth. Volcanic rocks are the reservoir for the outbreak and overflow phase, the main lithology are tuff, volcanic breccias and rhyolite, reservoir properties aren't influenced by the depth, compared with clastic rocks, the reservoir properties of volcanic rocks are better than the ones of clastic rocks at the same buried depth.2.In the southern Songliao basin, deep natural gas, according to genesis can be divided into three types, respectively is the carbon dioxide gas reservoirs, the mixed gas reservoirs mainly with hydrocarbons and hydrocarbon reservoirs. Horizontal distribution of natural gas has the following characteristics: the steep slope of depression control and fracture is the main place for CO2 enrichment, along with the updip direction of riffed basin, its gravitational differentiation is obvious, respectively is mixed gas reservoirs and hydrocarbon reservoir. The palaeohigh of long-term development in fault edge is the main place for hydrocarbon gas enrichment, mainly focus on secondary gas reservoir; Vertical distribution of natural gas has the following characteristics: along with the downdip direction of riffed basin, horizon containing gas begin to grow old, gas reservoir types are form secondary ones of fault lithology or fault block the lithology to primary ones by structural control.3.In the southern Songliao basin, deep fluids identification can use NML logging and gas logging。4.In Changshen-1 block, it has cumulative proven gas geological reserves 706.30×108m3, cumulative gas recoverable reserves 389.20×108m3, economic recoverable reserves 214.54×108m3, the second economic recoverable reserves 174.66×108m3, recovery of the Yingcheng group 60.0%, recovery of the Denglouku group 40.0%.Comprehensive evaluation indicates that the Changling 1 gas field belongs to a deep, high productivity, high abundance, and large gas field.